Egyptian security forces have detained six members of the Muslim Brotherhood, a security source told AFP.
Mohammed Ali Bishr, a member of the opposition movement's top decision making body, the guidance bureau, was arrested at dawn Sunday in Cairo, while the others were detained in the city of Alexandria and the southern town of Asyut.
The latest arrests are part of a wider crackdown that has been going on since December. At least 36 other members of the Brotherhood remain in custody, including Khayrat al-Shater, the movement's financier and third-ranking official.
Last week, in an interview to a local magazine, Egyptian President Hosni Mubarak said that the Brotherhood poses a threat to Egypt's security because the country would face international isolation should the Islamist movement become more powerful.