Sanaa, April 29 -- The death toll from Sunday's overnight U.S. airstrikes on three houses in Yemen's capital Sanaa rose to 12, with 4 others injured, Houthi-controlled health authorities said in a statement late Monday night.

The toll included women and children, the statement said.

The Houthi-run al-Masirah TV reported 15 airstrikes throughout Monday, targeting several locations across northern Yemeni provinces, including the capital Sanaa.

Meanwhile, casualties from U.S. dawn strikes on a migrant center in the northern province of Saada have risen to 68, all of them undocumented African migrants, according to the Houthi television.

The U.S. military was reportedly investigating the incident.

The Houthi group has been controlling...