United Nations, Sep 25 (IANS): UN Secretary-General Ban Ki-moon and the UN Security Council have condemned the terrorist attacks on a mosque in Sanaa city of Yemen Thursday, which left at least 30 people dead.

The secretary-general expressed "his deepest condolences and sympathies to the families of the victims" who lost their lives on Thursday during prayers for the Eid al-Adha, Xinhua news agency quoted the statement as saying.

Also on Thursday, the 15-nation Security Council condemned "in the strongest terms the horrific terrorist attacks" on the mosque in Sanaa, said a separate statement issued by the UN body.

"The Security Council expressed deep sympathy and condolences to the families and friends of those killed and injured, as well as to the people and the government of Yemen," the statement said.

The IS claimed responsibility for twin suicide bombing that left 30 people dead and scores of others injured.

"The Security Council reiterated its determination to combat all forms of terrorism, in accordance with their responsibilities under the charter of the UN," the statement said.

Al Qaeda and the IS have intensified their attacks against the Shia Houthi group since the Houthis started to advance into the southern regions, where the terrorist groups are active.

They have conducted a series of suicide attacks in Sanaa since early this year that killed more than 100 people.