Yemenis press on with anti-government protests

Tens of thousands are continuing with protests in several key cities across Yemen, pressing on with demands that the country's president step down.

The government has suspended classes at the universities in the capital Sanaa and the southern port city of Aden, which have been the focal points for daily demonstrations - inspired by the uprisings in Egypt and Tunisia - against President Ali Abdullah Saleh.

The protesters are rallying on the main squares of Sanaa, Aden, and the cities of Taiz and Hadramawt. They are also demanding an investigation into the killing of four people during Friday's protest in the northern town of Harf Sofyan.

Several members of Saleh's ruling Congress Party resigned on Saturday.

Saleh has been a key U.S. ally in the campaign against al-Qaida.