Police arrested 17 members of the banned Muslim Brotherhood group in six Egyptian provinces on Tuesday, the police and the group's web site said.
The dawn arrests were the latest in the ongoing crackdown on the country's largest opposition movement.
Also, Mahmoud Sayed Ghazlan, a senior leader of the Brotherhood, was arrested late Monday by state security, police officials said speaking on customary condition of anonymity.
Ghazlan is a member of the Guidance Bureau, the Brotherhood's highest decision-making body. He was freed in August 2005, after spending more than three years in prison after being convicted by a military court in 2002 on charges of belonging to an illegal organization and recruiting members.