Muslim groups in the United States condemned the hostage-taking incident at a synagogue in Texas on Saturday.

Four people, including a rabbi, were held by a gunman who entered the Congregation Beth Israel synagogue in Colleyville during a religious service. After hours of the standoff with law enforcement, all hostages were freed and the captor was dead, police said.

The Council on American-Islamic Relations (CAIR), the nation's largest Muslim civil rights and advocacy organization, denounced the incident.

"This latest antisemitic attack at a house of worship is an unacceptable act of evil. We stand in solidarity with the Jewish community," CAIR National Deputy Director Edward Ahmed Mitchell said in a statement on Sunday.

Meanwhile, the U.S. Council of Muslim Organizations said it stands in complete solidarity against anti-Semitism with the Jewish community and "condemns the evil, unjust, and unjustifiable hostage-taking of members of the Congregation Beth Israel synagogue."

"This heinous attack on a synagogue, a sacred and inviolable place of worship-and its congregants in the act of prayer-is utterly unacceptable," said Council Secretary-General Oussama Jammal.

The FBI identified the hostage-taker as British national Malik Faisal Akram, 44.

Matthew DeSarno, special agent in charge of the FBI's Dallas Field Office, said the captor acted alone with no others involved in the hostage-taking.