CAIRO (AFP) - Egyptian security forces arrested more than 400 supporters of ousted president Mohamed Mursi in one part of Cairo alone, following deadly clashes overnight, a security source said on Tuesday.

The 401 arrests were all made in the central Ramses area, where two people were killed in late-night violence, the official Mena news agency quoted the security source as saying.

There were also deadly clashes overnight in other parts of the capital.

In all, seven people died and 261 people were injured, health officials said.