CAIRO (AFP) - At least 51 people were killed in a dawn attack on supporters of ousted president Mohamed Morsi outside an elite army base in Cairo, Egypt's emergency services said, revising an earlier toll.

"The new toll from events outside the Republican Guard headquarters has risen to 51 dead and 435 wounded," Mohammed Sultan was quoted as saying by state news agency MENA.

The same emergency services had said earlier that 42 people died and 322 were wounded when shots were fired at the Muslim Brotherhood protesters.