It has been revealed that Nikolas Cruz who killed 17 people after he opened fire at Marjory Stoneman Douglas High School called the police distressed after his mother passed away just months ago

It has been revealed that the infamous 19-year-old Florida school shooter who killed 17 people after he opened fire at Marjory Stoneman Douglas High School called the police distressed after his mother passed away just months ago.

Nikolas Cruz called authorities just after Thanksgiving, saying he had been in a fight and was struggling with the death of his mother. 'The thing is I lost my mother a couple of weeks ago, so like I am dealing with a bunch of things right now,' he told police.

On January 5, just a month before the shooting, a woman who knew Cruz called the FBI tip line and said 'I know he's going to explode. 'She said her biggest fear was that he might resort to entering a school and just start 'shooting the place up.'

Forty days later Cruz opened fire at Marjory Stoneman Douglas High School in Parkland, Florida killing 17 people and injuring fourteen, five with life-threatening injuries.

Three months before the deadly shooting a friend dialed 911 concerned about Cruz' weaponry possessions. 'I need someone here because I'm afraid he comes back and he has a lot of weapons,' the friend said.

Cruz called authorities just after Thanksgiving, saying he had been in a fight and was struggling with the death of his mother. 'The thing is I lost my mother a couple of weeks ago, so like I am dealing with a bunch of things right now,' he told police

Authorities have acknowledged they underestimated many warning signs that Cruz was a deeply troubled kid. They were aware of his disturbing social media posts and social services visited his home several times.

There were dozens of calls to police with several people fearing he was capable of violence and murder.

On November 29 family friend Rocxanne Deschamps, who was looking after Cruz after his mother Lynda died in early November, told the dispatcher that Cruz already had about eight guns that he kept at a friend's house.

In the voice recording Deschamps can be heard telling police 'all he cares about is his gun,' reported the NY Times.

In another call to police she said 'It's not the first time he put a gun on somebody's head,' she also said that he once did that to his mother.

Deschamps has refused to comment and her lawyer has not responded to phone messages and emails.

On January 5, just a month before the shooting, a woman who knew Cruz called the FBI tip line and said 'I know he's going to explode. 'She said her biggest fear was that he might resort to entering a school and just start 'shooting the place up

Cruz opened fire at Marjory Stoneman Douglas High School in Parkland, Florida killing 17 people and injuring fourteen, five with life-threatening injuries

On November 30 an anonymous caller from Massachusetts told police that Cruz 'could be a school shooter in the making,' and that he was collecting guns and knives.

Additionally, two years ago authorities said they received information from the son of one of Cruz's neighbors that he 'planned to shoot up the school on Instagram.'

Despite multiple signs and calls to police and authorities, the bureau failed to investigate Cruz who had a 'desire to kill people,' according to several sources.

The FBI also received a tip from someone in Mississippi in September about a suspicious comment left on his YouTube channel by a 'nikolas cruz' who professed a desire to be a 'professional school shooter.'

They claimed they did not have enough information to determine if 'nikolas cruz' was a real name or a pseudonym, and the bureau said it could not justify keeping a file on the tip open, so they closed it in October.

Coral Springs Police Sgt. Jeff Heinrich speaks during a news conference at the Coral Springs police department on Friday

FBI deputy director, David L. Bowdich, spoke about the case on Friday and acknowledged the bureau's failure to investigate.

A tipster provided four Instagram accounts for Cruz, which she said showed photos of sliced up animals and the firearms he had collected. Apparently Cruz had used money from a life insurance policy after his mother's death to purchase the weaponry.

'If you go onto his Instagram pages, you'll see all the guns,' the woman said.

Coral Springs Police Officer Chris Crawford displays a combat field dressing kit similar to the one he used to dress a student's wounds while responding to the shootings at Marjory Stoneman Douglas High School

Two deputies have been placed on restricted duty while they investigate how two calls regarding Cruz' dangerous behavior could have been mishandled or disregarded.

Before she died in early November, Cruz's mother, Lynda, had called the authorities numerous times over the past decade to report her son.

She said he had hit her with the plastic hose from a vacuum, and once threw her against the wall after she took his Xbox away.

He suffered from anger issues as well as attention deficit hyperactivity disorder and obsessive-compulsive disorder.

Cruz allegedly shot a neighbor's chicken with a BB gun, cut himself, and possibly swallowed gasoline in a failed suicide attempt.