A suicide bomber targeted a concert in England by teen and tween favorite Ariana Grande Monday, killing at least 22 people — including children — in a blast that went off just as the crowd was exiting.

The attack at the Manchester Arena also left about 60 people injured, according to police.

The suicide bomber was “carrying an improvised explosive device, which he detonated causing this atrocity,” Chief constable Ian Hopkins said at a press conference early Tuesday.

Among the casualties were a large number of young girls, according to CBS News.

The scene was “like something out of a war film,” one witness told the BBC.

“I get up and look round, there’s just bodies everywhere,” the man, named Andy, told the network.

“I reckon 20-30 bodies. I can’t say if some of them were dead but they looked dead. They were covered in blood and were really seriously hurt.”

Witnesses said the explosion rocked the foyer of the arena that leads to a train station. Cellphone video of the incident showed teen girls and parents screaming as they panicked and ran for safety. The stadium seats 21,000 people.

A source told The Post that officials were looking at the incident as a possible terrorist suicide bombing.

Witnesses described lots of children without parents, running and screaming in all directions.

Most were stranded after local police halted all train and tram services.

“If you were Manchester arena’s attack & can’t find you child, check Holiday inn, they have taken 60+ lost kids,” wrote one Twitter user.

While many youngsters hunkered down at that hotel, others took shelter in people’s homes and other public places. Worried parents were turning to social media in the attempt to find their little ones.

“My six-year-old niece was in Manchester tonight for the concert,” tweeted Charlotte Hall. “We haven’t heard from her/her guardian and are sick with worry.”

Karen Ford, who was at the concert with her husband, described the chaos that unfolded afterward to BBC News.

“The problem was, a lot of children were there without parents,” she explained. “There was no one to calm them down, so everybody was just screaming, and crying and pushing.”

The Greater Manchester Police Department released a statement saying the incident was “being treated as a terrorist incident until police know otherwise.”

NBC News said that evidence, including a body at the site of the blast, indicated that the bombing was a suicide attack.

Hopkins said investigators were coordinating with British intelligence.

“This is clearly a very concerning time for everyone,” he said at a news conference early Tuesday.

“The injured are being treated at six hospitals across Greater Manchester. My thoughts are with all those who have been affected and we are doing all we can to support them.”

Grande — a 23-year-old Floridian who was launched to stardom in the Nickelodeon TV series “Victorious” — is a Grammy-nominated singer and was named one of Time magazine’s 100 most influential people in the world in 2016.

“We mourn the lives of children and loved ones taken by this cowardly act,” Grande’s manager Scooter Braun said in a tweet.

British Primer Minister Teresa May said the incident was being treated as an “appalling terrorist attack” and she called for an emergency meeting to address the situation.

There was no claim of responsibility, but online, supporters of ISIS celebrated.

One wrote, “May they taste what the weak people in Mosul and Raqqa experience from their being bombed and burned,” according to the SITE Intelligence Group.

The attack came on the third anniversary of the murder of British soldier Lee Rigby, who was brutally slain by an cleaver-wielding terrorist.

The concert bombing is the deadliest terror attack in the UK since the 7/7 London transit bombings, which at killed 52 people in 2005.

In March, a man driving a car into pedestrians killed five people in London before being shot dead by a police officer.

“My thoughts are with the victims and the families of those affected,” May said.

The US Department of Homeland Security released a statement that said there was “No information to indicate a specific credible threat involving music venues.”

The NYPD received an increase in calls for suspicious packages Monday night and Commissioner James O’Neill said they were assessing whether the attack had any “implications” for the city.

Gov. Cuomo issued a statement that said law enforcement would step up security at high-profile locations such as bridges and tunnels in New York.

Additional reporting by Larry Celona and Post Wire Services