Usaama Rahim, the man whom Boston police fatally shot Tuesday, was a suspected terrorist, according to officials with the U.S. Joint Terrorism Task Force. Rahim was shot after he refused to drop a large knife that authorities told him to drop.

Usaama’s brother, Ibrahim Rahim, posted about the death on social media. Ibrahim is an imam at the Lighthouse Mosque in Oakland, California. According to Ibrahim, his brother was shot at a bus stop while he was on his way to work.

Ibrahim wrote that Usaama had been shot three times in the back. He added that his brother was talking to their father over the phone when he was shot.  

According to a law enforcement official, Usaama was possibly going to do “something sinister.” He added that there was information that the suspect was engaged in suspicious actions. While Usaama’s brother said that his brother had been shot in the back, the official said that the terror suspect had been shot in the chest.

Boston Police Commissioner William Evans said that Usaama had been under the U.S. Joint Terrorism Task Force surveillance. "Unfortunately, he came at the officers and, you know, they do what they were trained to do and, unfortunately, they had to take a life," the CNN quoted Evans.