Donald Trump's credibility has been called into question over comments he has made about Muslims in New Jersey celebrating on 9/11 and now a report from NJ.com suggests that an aspect of that story is true.

While the New Jersey news organization called Trump's claim of thousands of Muslims celebrating on 9/11 to be 'baseless,' reporters found evidence of 'at least two modest celebrations' that occurred.

'Some men were dancing, some held kids on their shoulders,' said retired police officer Peter Gallagher, who said he cleared a rooftop celebration of some 20 to 30 people that day.

Donald Trump has said repeatedly that thousands of New Jersey Muslims cheered on 9/11 as the twin towers crashed down - a claim that, until now, has been widely debunked

While NJ.com said Donald Trump's suggestion that thousands of Muslims celebrated 9/11 was 'baseless,' journalists found evidence of 'at least two modest celebrations' that day

'The women were shouting in Arabic and keening in the high-pitched wail of Arabic fashion,' Gallagher continued. 'They were told to go back to their apartments since a crowd of non-Muslims was gathering on the sidewalk below and we feared for their safety.'

That apartment building, located in Jersey City, New Jersey, was visited by FBI agents several days later and some residents were taken into custody, the Star-Ledger reported.

Another celebration occurred on Jersey City's John F. Kennedy Boulevard, according to eyewitnesses, which is near the mosque where Omar Abdel-Rahman, known as 'the blind sheikh,' had preached before his terrorist ties were uncovered during the investigation into the 1993 World Trade Center bombing.

'When I saw they were happy, I was pissed,' said 56-year-old Ron Knight, who said he heard cries of 'Allahu Akbar' while making his way through a crowd of 15 to 20 people on the street.

60-year-old Carlos Ferran, who lives in the same apartment building of Knight, also remembered coming across the gathering while he was walking to a liquor store to buy beer.

'Some of them had their hands in the air,' Ferran told NJ.com. 'They were happy.'

A crowd was reportedly gathered on a rooftop from an address on the same street, 2801 John F. Kennedy Blvd., but officers dispatched were unable to enter the building because the front door was locked.

'By the time I got to the roof, no one was there,' said retired officer Bruce Dzamba.

This was the building mentioned in a local news report by journalist Pablo Guzman, which Trump had pointed to as proof.

On the air, Guzman, citing unnamed sources, said federal officials had detained eight men at this scene who were cheering.

Retired officer Arthur Teeter, who worked in the radio room on 9/11, told NJ.com that this was one of several addresses where cheering was witnessed and that bystanders called in to report.

'They said they were witnessing this,' Teeter said. 'We don't send out cars based on someone saying somebody else saw it.'

NJ Advance Media journalists found a handful of other officers who shared similar recollections but would not go on the record, in part, because they feared repercussions from Jersey City Mayor Steven Fulop, who has repeatedly said that the celebrations did not happen.

'There are no records of this, and over time, what has happened is that it has become urban legend in many cities where people say they heard or saw something,' Fulop said. 'At the end of the day, the only thing we can go on are facts. There is no media record. There is no police record. There is nothing.'

Several retired police officers who worked on 9/11 said they remembered celebrations and reports of cheerign on rooftops in Jersey City, where residents could see the smoke coming up from the fallen towers

Fulop questioned why Gallagher didn't file a report at the time.

Gallagher responded saying that 'if no violence is involved it is, and was, a minor assignment.'

'The people on the roof were cooperative as were the people on the sidewalk,' he continued. 'No report was necessary.'

Other officers who served alongside Gallagher said he wouldn't make something like this up.

'I would have no reason to doubt Pete,' said Tom Comey, a former New Jersey police chief. 'He's a man of high integrity.'

Gallagher told NJ.com that he didn't come forward to make a political statement, just to set the record straight.

'The celebrations happened,' he said. 'All or most on rooftops. The [Jersey City Police Department] leadership put on an order to seek the cooperation of the Muslim celebrants for their own safety. By 2 p.m. there were no more celebrations and my squad was designated a roving patrol to guard about six mosques.'

Trump again made a claim about Muslims celebrating on 9/11 when he appeared on This Week with George Stephanopoulos yesterday.

'Oh there were plenty of people cheering, believe me,' Trump said. 'And I've come up with plenty [of evidence],' he told the host, a day before the NJ.com story came out.

'And a lot of people - thousands of people - have been calling and writing and emailing, many people saw it. And it was in New Jersey and it was all over the world, George,' Trump said.

Trump said, however, that there were 'articles written about it,' articles that, to this day, have never been found.