A man reported to be a senior member of al-Qaeda who escaped from a U.S. prison last year has been arrested in southeastern Afghanistan by U.S. and Afghan forces, an Afghan provincial police chief said on Monday.

U.S. and Afghan forces arrested six people on Thursday in the city of Khost, said Mohammad Ayub, the provincial police chief. He said the four Afghans, an Arab and a Pakistani are being held by U.S. forces.

In a report by Pakistan's daily The News, one of those arrested was Abu Nasir al-Qahtani. He is one of four Arab al-Qaeda members to have escaped from a U.S. prison in July 2005 in Bagram, about 60 kilometres northwest of Kabul.

"I'm not sure if this Arab is the one of the four Arabs who escaped from Bagram last year, but what I can tell you is that he is an important al-Qaeda member," Ayub said in a telephone interview with the Associated Press.

U.S. military spokesman Lt. Col. Paul Fitzpatrick declined to identify the arrested al-Qaeda operative.

Last week, coalition forces said a "known al-Qaeda terrorist" and five other extremists had been arrested on Nov. 6 near Khost.

Officials said the detainee has "known ties to al-Qaeda leadership," and was detained with Saudi and Pakistani nationals.

With files from the Associated Press