Egypt's largest opposition group, the Muslim Brotherhood, says government security forces have arrested 29 more of its members.
Brotherhood officials say the arrests occurred Tuesday during a series of dawn raids in three provinces north of Cairo. Senior members of the group were said to be included in those arrested.
A security source confirmed the round-up but said 20 members of the Brotherhood were detained.
Last month, Egyptian police arrested dozens of Muslim Brothers after they staged a military-style protest at Al Azhar University, the seat of Islamic learning.
The Brotherhood is Egypt's oldest Islamic group. It is officially banned, but its candidates ran as independents in 2005 legislative elections. The group holds 88 seats in Egypt's parliament, making it the largest opposition bloc.
In the past year, police have arrested hundreds of Brotherhood members.
Last week, Egypt's President Hosni Mubarak proposed constitutional reforms that would ban religious groups from forming political parties.
Some information for this report was provided by AFP, AP and Reuters.