Fighting returns to Yemen capital day after UN envoy suggested deal to resolve crisis reached

Smokes rises from an area due to clashes between Sunni militiamen and Hawthi Shiite rebels in Sanaa, Yemen, Sunday, Sept. 21, 2014. Yemen's top security body imposed an overnight curfew in restive areas of the capital, Sanaa, on Saturday after Shiite rebels took over the state television building amid heavy clashes and the U.N. envoy to the country signaled that a deal had been reached to end the violence. (AP Photo/Hani Mohammed) (The Associated Press)

A Hawthi Shiite rebel stands guard at a checkpoint on a street leading to the state television building in Sanaa, Yemen, Sunday, Sept. 21, 2014. Yemen's top security body imposed an overnight curfew in restive areas of the capital, Sanaa, on Saturday after Shiite rebels took over the state television building amid heavy clashes and the U.N. envoy to the country signaled that a deal had been reached to end the violence. Arabic on a banner reads,"God is great. Death to America. Death to Israel. A curse on the Jews. Victory to Islam." (AP Photo/Hani Mohammed) (The Associated Press)

Hawthi Shiite rebels stand guard at a checkpoint on a street leading to the state television building in Sanaa, Yemen, Sunday, Sept. 21, 2014. Yemen's top security body imposed an overnight curfew in restive areas of the capital, Sanaa, on Saturday after Shiite rebels took over the state television building amid heavy clashes and the U.N. envoy to the country signaled that a deal had been reached to end the violence. Arabic on a banner reads,"God is great. Death to America. Death to Israel. A curse on the Jews. Victory to Islam." (AP Photo/Hani Mohammed) (The Associated Press)

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.