Police authorities in Damanhour in Egypt's Delta arrested twelve suspects late Saturday for instigating clashes amidst multiple-city violence between Muslim Brotherhood supporters and opposition that erupted Friday.

Protests erupted day after President Mohamed Morsi - who hails from Brotherhood ranks - announced a controversial constitutional declaration.

The suspects were arrested for allegedy setting fire to railroad tracks, disrupting rail traffic to and from Cairo in addition to throwing rocks and Molotov's at police officers, which, according to the ministry of interior injured eight policemen.

Clashes continued into dawn Sunday as tear gas was used by police to disperse protesters. 

The Brotherhood reported on Sunday that 14 of its members were injured by "thugs and infiltrators who attacked our offices," which were burned allegedly by anti-Brotherhood protesters on during the weekend.

Damanhour, the capital of Beheira province, has been a Brotherhood stronghold for the past two decades. The province produced some of the most notable figures in the group's leadership, including Gamal Heshmat.

In 2005 Damanhour saw clashes and confrontations with security forces similar to the ones over this weekend.

Back then, however, the Brotherhood geared anti-government protests over rigged parliamentary elections that favoured Mubarak's National Democratic Party candidate.##