Cairo: Egypt's opposition Muslim Brotherhood said on Monday that police stopped it from sending a supply convoy to the Gaza Strip and arrested dozens of its members.

Abdel Fatah Rizq, a member of the Islamist group, said at least 50 activists have been arrested.

Hundreds of vehicles were set to ferry supplies to the border with the Gaza Strip.

A security official says at least 20 protesters were arrested outside the Journalists' Syndicate in downtown Cairo on Monday.

Thousands of police blocked the streets around the area and chased activists into nearby buildings.