A Jewish congregant, killed during an attack on a Manchester synagogue on Thursday, may have died from police gunfire, authorities said in a statement on Friday.

One of the wounded was also shot during the emergency response, the statement added.

What did the police say?

Two people were killed and three people were seriously wounded in Thursday's attack on the Heaton Park Congregation Synagogue in Crumpsall, north Manchester.

It happened on Yom Kippur, the holiest day in the Jewish calendar.

Authorities identified the perpetrator as a 35-year-old Syrian-born British citizen, who drove into pedestrians outside the synagogue and attacked with a knife before being shot dead by police.

Greater Manchester Police (GMP) said it appears one of the dead may have been inadvertently shot by armed officers since the attacker was not carrying a firearm.

GMP chief constable Steve Watson, in a statement, called it a "tragic and unforeseen consequence of the urgently required action" taken by police officers to bring the "vicious" attack to an end.

The police complaints watchdog said it was carrying out an investigation into what happened.

Attackers may have been influenced by Islamist ideology

Two people, Adrian Daulby, and Melvin Cravitz, were killed during the antisemitic attack on the synagogue. The three others injured remain in hospital.

Police have declared the incident an act of terrorism.

Counter Terrorism Policing chief Laurence Taylor said the attacker may have been influenced by Islamist ideology, although investigators have yet to establish a clear motive.

Taylor added that the assailant was not known to Counter Terrorism Policing but has prior criminal history including a recent arrest for rape.

Earlier, GMP said that three people were arrested in connection with the attack, describing them as "two men in their 30s and a woman in her 60s" who were in custody "on suspicion of commission, preparation and instigation of acts of terrorism."

Edited by: Srinivas Mazumdaru