London (CNN) A man who hid inside a toilet cubicle as terror struck London's Borough Market said he thought it was "game over" for him and his friends.

"Gareth", not his real name, was enjoying an evening out at the Black & Blue Restaurant with his fiancee and another couple when the attack occurred, and told CNN how he spent the night inside the restaurant's bathroom as the horror unfolded amidst the sounds of screaming and crashing glass.

Gareth and his friends ran up the stairs and into a bathroom as a man, wearing a brown coat, entered the restaurant armed with what Gareth described as a "machete".

His friends, one of whom is heavily pregnant and had been due to give birth last week, followed him into the cubicle. The four of them shared the small space while trying to keep quiet, fearing they could be found by the attacker and shot through the door.

It was there that he began to message the husband of CNN's Isa Soares, a close friend, to tell him that he was trapped and to ask him to call the police.

On Sunday, Gareth spoke to Soares about his ordeal, live on air.

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"It's the first time in my life that I felt it was game over," he said.

"It was looking into the fear of my friend's eyes in that one cubicle and looking at a woman who is about to give birth, seeing the fear in her eyes and trying to calm her down and not being able to make a sound because we could hear voices outside the door.

"People were walking up and down so we had to keep deathly silent. We thought we were going to get gunned down through the door. We could hear the shots outside. The fear was immense."

'Chaos'

At least seven people died and 48 people were injured in a two-pronged attack on London Bridge and Borough Market, with police shooting the three suspected assailants dead.

The attack started when a van rammed into pedestrians on London Bridge and ended with multiple stabbings at restaurants nearby.

Police say the suspects were shot dead within eight minutes of the first call.

Gareth, who had only booked the Black & Blue Restaurant by chance, had already experienced terror in London after being close to the Westminster attack in March.

Friend of mine was hiding in toilet of restaurant in Borough! Said men walked in with knifes. heard gunshots! He's now safe! #BoroughMarket — Isa Soares (@IsaCNN) June 4, 2017

Gareth, who lives in Chester, about 200 miles northwest of London, was in the area for one night and had chosen to dine in one of the city's most vibrant districts.

But as he was looking outside at the high street, the terror began to unfold after a what he described as a "loud bang."

"There was a bit of chaos, panic and fear in the restaurant as well because we didn't really know what was going on," he said.

"Then glass started smashing and we ran upstairs to the toilet.

"Just as I looked down the stairs, a guy had come in to the restaurant and uncovered a big knife. It looked like a machete.

"I just grabbed my friends and dashed into one cubicle with the four of us."

Photos: London Bridge, nearby cafe target of terror attack Forensic officers work at the scene of a terror attack at London Bridge in London on Sunday, June 4. At least seven people were killed in attacks late Saturday as a van mowed down pedestrians on London Bridge before attackers then stabbed victims at nearby Borough Market. Hide Caption 1 of 26 Photos: London Bridge, nearby cafe target of terror attack Counterterrorism officers patrol near the scene of the attack on London Bridge. When speaking to the media on Sunday, British Prime Minister Theresa May did not announce any increase in the UK terror threat level. Hide Caption 2 of 26 Photos: London Bridge, nearby cafe target of terror attack A woman reacts after asking a Police officer to lay flowers near London Bridge as a tribute to the victims of the attack. Hide Caption 3 of 26 Photos: London Bridge, nearby cafe target of terror attack UK police officers on Sunday continue their investigation into the terror attacks on London Bridge and in a nearby restaurant district. The attacks on June 3 came days before a general election and two weeks after 22 people were killed when a suicide bomber targeted an Ariana Grande concert in Manchester. Hide Caption 4 of 26 Photos: London Bridge, nearby cafe target of terror attack Prime Minister Theresa May makes a statement at 10 Downing Street, following a Cobra security meeting in response to Saturday night's terror attack. Violence must "never be allowed to disrupt the democratic process," May said, adding that Thursday's general election will go ahead. Hide Caption 5 of 26 Photos: London Bridge, nearby cafe target of terror attack Abandoned buses line London Bridge as the scene remains under investigation following the attack. Metropolitan Police Assistant Commissioner Mark Rowley said in a statement Sunday that a white van struck pedestrians on London Bridge. Attackers then left the vehicle and "a number of people were stabbed, including an on-duty British Transport Police officer who was responding to the incident at London Bridge," said Rowley. The officer received serious but not life-threatening injuries. Hide Caption 6 of 26 Photos: London Bridge, nearby cafe target of terror attack Counter terrorism officers move up an escalator under The Shard, an iconic highrise near the scene of last night's London Bridge attack. Hide Caption 7 of 26 Photos: London Bridge, nearby cafe target of terror attack A group of police forensic officers walks in the street outside Borough Market. Hide Caption 8 of 26 Photos: London Bridge, nearby cafe target of terror attack People lie on the ground after being detained by police at Elizabeth Fry apartments in Barking, east London, which officers raided Sunday, June 4, following Saturday's terror attack at London Bridge and Borough Market. Hide Caption 9 of 26 Photos: London Bridge, nearby cafe target of terror attack A bouquet of flowers left near the police cordon at London Bridge on June 4. Hide Caption 10 of 26 Photos: London Bridge, nearby cafe target of terror attack A view from above shows where a van struck pedestrians on London Bridge -- and then crashed into a barrier. Hide Caption 11 of 26 Photos: London Bridge, nearby cafe target of terror attack This image, from London's Borough Market, shows two of the attackers after they were shot by London police. The attackers drove a white van into pedestrians on London Bridge, leaving bodies lying in the roadway, a witness to the incident told CNN Hide Caption 12 of 26 Photos: London Bridge, nearby cafe target of terror attack Armed police patrol near London Bridge on Saturday, June 3. Mayor Sadiq Khan said it was a "deliberate and cowardly attack" on Londoners enjoying Saturday night out. Hide Caption 13 of 26 Photos: London Bridge, nearby cafe target of terror attack The white van used in the attack is seen near London Bridge. Hide Caption 14 of 26 Photos: London Bridge, nearby cafe target of terror attack Police carry out a search near empty buses on London Bridge, Saturday, June 3. Hide Caption 15 of 26 Photos: London Bridge, nearby cafe target of terror attack A person is treated for injuries near London Bridge. Hide Caption 16 of 26 Photos: London Bridge, nearby cafe target of terror attack Members of the public flee after reports of the incident involving a vehicle and pedestrians. Hide Caption 17 of 26 Photos: London Bridge, nearby cafe target of terror attack Police and emergency responders attend to an injured person. Hide Caption 18 of 26 Photos: London Bridge, nearby cafe target of terror attack An armed Police officer gestures after the attack in central London. Hide Caption 19 of 26 Photos: London Bridge, nearby cafe target of terror attack Guests from the Premier Inn Bankside Hotel are evacuated following the attacks. Hide Caption 20 of 26 Photos: London Bridge, nearby cafe target of terror attack A woman wearing an emergency blanket talks on her phone at London Bridge train station. London Bridge Tube station was closed and London Bridge was closed in both directions. Hide Caption 21 of 26 Photos: London Bridge, nearby cafe target of terror attack Armed police raid The Blue Eyed Maid on Borough High Street. Hide Caption 22 of 26 Photos: London Bridge, nearby cafe target of terror attack Debris and abandoned cars remain at the scene of one of the incidents. Hide Caption 23 of 26 Photos: London Bridge, nearby cafe target of terror attack Police sniffer dogs are seen at London Bridge. Hide Caption 24 of 26 Photos: London Bridge, nearby cafe target of terror attack A helicopter flies near London Bridge. Hide Caption 25 of 26 Photos: London Bridge, nearby cafe target of terror attack People are led to safety on Southwark Bridge, away from London Bridge. Hide Caption 26 of 26

'Blood in the restaurant'

Scared to make a sound, the four friends remained inside the cubicle for an hour.

Unable to make a call for fear of being discovered, he sent text messages to close friends, and posted to Facebook to urge people to call the police and alert them to the attack.

It was only when they heard that the police Armed Response Team was in the building that the end appeared in sight.

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But even that brought fear with Gareth worried those claiming to be the police could be imposters.

"It put the fear of God into me when I had to open the door but luckily I saw it was fine," he said.

"They took us out. There was blood in the restaurant, blood in the street. A number of people were clutching themselves.

"We then had to run 100 or 150 meters down the road. it was extremely scary."

Gareth went to hospital with his fiancee and friends. His friend, who is pregnant, is fine and the baby has not been harmed.