By the Associated Press:

A rabbi who was among four people held hostage at a Texas synagogue said Sunday that their armed captor grew “increasingly belligerent and threatening” toward the end of the 10-hour standoff, which ended with an FBI SWAT team rushing into the building and the captor’s death.

Authorities identified the hostage-taker as a 44-year-old British national, Malik Faisal Akram, who was killed Saturday night after the last hostages ran out of Congregation Beth Israel around 9 p.m. The FBI said there was no indication that anyone else was involved, but it had not provided a possible motive as of Sunday afternoon.

Rabbi Charlie Cytron-Walker credited security training that his suburban Fort Worth congregation has received over the years for getting him and the other three hostages through the ordeal, which he described as traumatic.

“In the last hour of our hostage crisis, the gunman became increasingly belligerent and threatening,” Cytron-Walker said in a statement. “Without the instruction we received, we would not have been prepared to act and flee when the situation presented itself.”

President Joe Biden called the episode an act of terror. Akram could be heard ranting on a Facebook livestream of the services and demanding the release of Aafia Siddiqui, a Pakistani neuroscientist suspected of having ties to al-Qaida who was convicted of trying to kill U.S. Army officers in Afghanistan.

Speaking to reporters in Philadelphia on Sunday, Biden said Akram allegedly purchased a weapon on the streets.

Federal investigators believe Akram purchased the handgun used in the hostage taking in a private sale, according to a person familiar with the matter who spoke on condition of anonymity because the investigation is ongoing. Akram arrived in the U.S. at John F. Kennedy International Airport in New York about two weeks ago, a law enforcement official said.