DETROIT -- Federal authorities in Detroit say the son of a slain leader of a radical U.S. Sunni Islam group has been arrested across the border in Windsor, Ontario.

The FBI said 30-year-old Mujahid Carswell was arrested Thursday in Windsor by the Royal Canadian Mounted Police. No other details were released. He was considered armed and dangerous.

Carswell was among 11 people charged Wednesday in a criminal complaint in federal court in Detroit. Their leader, his father, 53-year-old Luqman Ameen Abdullah, was killed in a shootout with agents during a series of raids in Detroit and Dearborn Wednesday.

Andrew Arena, the head of the FBI office in Detroit, said the men follow "a very hybrid radical ideology" that mainstream Muslims "would not recognize."

Two were still at large: 30-year-old Yassir Ali Khan of Warren and Ontario, and 33-year-old Mohammad Philistine of Ontario.

The FBI has been investigating the group called the Ummah, which translates to “the brotherhood” for more than two years by using three inside informants known as S-1, S-2, S-3.

S-1 told the FBI that he witnessed Carswell using toilet bowl cleaner to scrub blood from the basement of Masjid Al-Haqq, which is the mosque that his father ran, after S-3 witnessed a murder committed there.

Carswell told S-3 that he belonged to a large and well-organized mosque in Windsor and that he trains children there, ages 8 to 18 years old, in martial arts.

He also told the informants that although his father was a soldier, the rest of the organization had a duty to protect him because he had a higher role, according to a federal affidavit.