A suicide bombing suspected of having been carried out by Al Qaeda militants killed 10 soldiers standing guard at an intelligence building in the western Yemeni city of Hodaida on Friday.
"Gunmen believed to belong to Al Qaeda attacked the main gate of the political security building with rocket-propelled grenades and machine guns after a car bomb driven by a suicide bomber attacked the back gate," one of the sources told Reuters.
Both Al Qaeda and ISIS control swathes of territory in Yemen, which has been witnessing intense clashes between the Iranian-backed Houthi militias and the Saudi-led coalition.
Saudi Arabia set up a coalition to carry out air strikes against Houthi rebels in Yemen on March 2015, after Yemeni President Abd Rabbuh Mansur Hadi was forced by the militants to flee his country and go into exile in the Saudi capital Riyadh.
Hodiada and the northern territories of Yemen are controlled by Houthis - who are allied with the former Yemeni president Ali Abdullah Saleh.
On Oct. 6, ISIS killed 22 people, including troops from the United Arab Emirates, at a government headquarters in the southern port city of Aden.
More than 5,400 people have been killed in Yemen since the start of the civil war, which has turned into a regional struggle.
According to residents of the Houthi-controlled capital Sanaa, more than 60 coalition air strikes were carried out in the last two days
On Thursday, five people including two children were killed in Sanaa.
Meanwhile, Houthi forces fired a ballistic missile at Saudi Arabia on Thursday, in retaliation to the attacks of the Saudi-led coalition, a source in the Iranian-allied group said.
The last seven months a number of missiles have been launched at Saudi Arabia by Houthi rebels, but the missiles were shot down by American provided Patriot Missile Defence System at least twice.
In recent weeks the Saudi-led coalition made advances in the east of Yemen's capital Sanaa and captured Bab al Mandeb, which connects the Red Sea with the Gulf of Aden.
There were two separate states in Yemen, in the north and in the south. Both territories were united in 1990 before a civil war broke out in 1994, resulting in the defeat of the southern separatists.