NAIROBI, Kenya (AP) — The U.S. State Department says an American citizen was among those killed Tuesday when extremists stormed a luxury hotel in the capital of Kenya.

Africa’s Islamic militant group, al-Shabab, claimed responsibility for the attack, which involved explosions and people being gunned down at cafe tables. It’s the same group that carried out the 2013 attack at the nearby Westgate Mall in Nairobi that left 67 people dead.

A department official confirmed Tuesday that a U.S. citizen was killed, but declined to identify the individual. The official said the State Department is offering condolences to the victim’s family and friends. Out of respect for relatives of the deceased, the department declined further comment.

The official was not authorized to discuss the matter publicly and spoke only on condition of anonymity.