The strikes marked the first shots fired by the U.S. in anger against the Houthis in Yemen.
The attack is said to have hit a three-storey block of flats in Amran City.
Around 5,000 are coordinating the support at the moment. Initially, this work involved 45 employees.
The attacks involved a suicide bomber, a car bomb and an improvised explosive device.
The terrorist group of Iraq and the Levant has launched a double attack in the Yemeni city of Aden killing 45 people.
A US-backed coalition of mostly Arab states began air strikes a year ago in support of the government of the exiled president.
More than 14 million are in need of medical care.
Yemen's army took control of some areas of the city of Aden in the south.
The officials said that President Hadi was inside the building at the time of the attack, but was unharmed.