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NAIROBI, Kenya (AP) — Gunmen threw grenades and opened fire Saturday killing at least 22 people in an attack targeting non-Muslims at an upscale mall in Kenya's capital that was hosting a children's day event, a Red Cross official and witnesses said.

The attackers remained inside and firing subsided as military surrounded the mall hours after the attack. People continued to trickle out from hiding places within the Westgate mall, which is frequented by expatriates and rich Kenyans in Nairobi's affluent Westlands neighborhood.

Kenya Red Cross official Abbas Gullet said at least 22 people were killed in the attack that police blamed on terrorists. He said the death toll would likely rise.

"We are treating this as a terrorist attack," said police chief Benson Kibue, adding that there are likely no more than 10 attackers involved.

Police did not say what group was responsible for the attack.

Somali's rebel group al-Shabab vowed in late 2011 to carry out a large-scale attack in Nairobi in retaliation for Kenya's sending of troops into Somalia to fight the Islamic insurgents.