Two teenagers have been arrested in England as part of an investigation into a hostage-taking incident at a synagogue in Texas on Saturday.
British citizen Malik Faisal Akram, 44, from Blackburn, was shot dead after a clash with police in Colleyville.
Details of the age or gender of the couple arrested in south Manchester on Sunday evening were not disclosed.
Manchester police said they were liaising with local communities and were continuing to assist in the U.S. investigation.
The two teenagers were also said to have been arrested "as part of an ongoing investigation into the attack" and were being held in custody for questioning.
According to U.S. police sources, Akram arrived in the country via New York's JFK International Airport two weeks ago.
Akram's brother, Gulbar, confirmed his death in a statement posted on the Blackburn Muslim Community's Facebook page. He apologized to the victims and said that his brother was suffering from mental health problems, rtv21.tv reports
Metropolitan Police previously confirmed that counter-terrorism officers were in contact with U.S. authorities and the FBI.
The siege began around 11:00 a.m. local time (16:00 GMT) when police were called to the Beth Israel Congregation Synagogue on the outskirts of Dallas.
Akram gained initial entry into the synagogue during the service by claiming to be a homeless man, according to a police source.
Among the hostages was the rabbi of the synagogue. One was released after six hours and the other three were taken to security by police a few hours later.
All the hostages in the synagogue were released unharmed.
US President Joe Biden called the hostage-taking an "act of terror" and Britain condemned the attack.
British Foreign Secretary Liz Truss described it as an "act of terrorism and anti-Semitism".
"We stand with the United States in defending the rights and freedoms of our citizens against those who spread hatred," Truss said in a Twitter post./ 21Media