Yemeni security officials say heavy fighting has resumed in the capital, Sanaa, following days of violence that left more than 140 dead and prompted thousands to flee their homes.

The clashes erupted on Sunday around the Iman University, a bastion of Sunni hard-liners that is seen as a recruitment hub for militants. More fighting raged near a major military base in the Yemeni capital.

There were no official casualty figures from Sunday's violence.

Shiite rebels known as Hawthis took over the state television building following heavy clashes on Saturday.

The U.N. envoy to Yemen, Jamal Benomar, had signaled that an agreement was reached to halt the violence on Saturday, and that preparations are underway to sign the agreement.