UNITED NATIONS -- The UN Security Council on Wednesday voiced its outrage by the attack on a UN compound in Mogadishu, Somalia, which killed at least 15 people.

Mark Lyall Grant, the permanent representative of the United Kingdom to the UN who holds the rotating council presidency for June, said in a statement that the members of the Security Council reiterate their determination to combat all forms of terrorism..

"Terrorism in all its forms and manifestations constitutes one of the most serious threats to international peace and security, and that any acts of terrorism are criminal and unjustifiable regardless of their motivation, wherever and whenever and by whomsoever committed," Grant said.

Suicide bombers attacked the UN's office in Mogadishu on Wednesday, leaving at least 15 people dead, including eight working for the UN. The al-Qaida linked militant Al-Shabaab group said it was behind the assault.

In the statement, the Council members extended their condolences to the victims and their families, as well as to the people and the government of Somalia, and underlined the support for all UN personnel working to bring peace, stability and prosperity to the Somali people.

Meanwhile, the Council reminded states that they must ensure that measures taken to combat terrorism comply with all their obligations under international law, in particular international human rights, refugee and humanitarian law, Grant said.

"The Security Council underlines that terrorist acts in Somalia will not lessen the Council's resolve to support Somalia's transition to peace and stability," said Grant. "Furthermore, the members of the Security Council reiterate their willingness to take action against those whose behavior threatens peace, stability or security of Somalia."