A policeman was killed and three people wounded in an explosion in Dadaab refugee camp Monday, the latest in a spate of grenade and landmine attacks in Kenya's border regions with Somalia.

"One person has been killed in the explosion, three injured," said Kenya Red Cross spokesperson Nelly Muluka, adding that the blast was in the Ifo II section of Dadaab, the world’s largest refugee camp complex.

A Kenyan court issued an arrest warrant Monday for Sudan's President Omar al-Bashir, wanted by the International Criminal Court on genocide charges.

Though Kenya has ratified the founding the ICC's founding Rome statute, it failed to arrest the Sudanese leader when he visited the country in August 2010.

Two people were killed in a grenade attack on a church in eastern Kenya, residents said Sunday, amid a spate of violence that has raised concerns for Kenya's key tourism industry.

"They attacked people who reside in the church compound," in Garissa, said a worshipper belonging to the town's East African Pentecostal Church. "Two people died and the others have been taken to hospital."

A blast went off Saturday along a road in the world's largest refugee camp in eastern Kenya near the border with Somalia, but no one was injured, officials said.

The explosion appeared to be minor and one of the officials said if it turns out to be an explosive device planted by insurgents it may have been improperly wired. The two officials spoke on condition they weren't identified.

Kenya said Wednesday that Somali Islamist rebels had received a third planeload of armaments, as its forces prepare to push forward against the Al-Qaida-linked militants in the war-torn nation.

Kenyan soldiers and tanks pushed into Shebab-controlled southern Somalia some two weeks ago to fight the insurgents and curtail their ability to launch cross-border attacks.

A Kenyan air raid at the weekend that struck a camp hosting thousands of displaced Somalis has killed five people, after two victims succumbed to their injuries, an aid official said Monday.

A bomb on Sunday hit the camp, in the southern town of Jilib, where some 9,000 internally displaced children have sought refuge.

Kenya vowed Saturday to keep troops in Somalia as long as needed to prevent attacks on its soil by the Islamist group Shebab and called for reinforcements in an increasingly regionalized conflict.

"When the Kenyan government and the people of this country feel they are safe enough we shall pull back," the country's military chief General Julius Karangi told journalists Saturday, refusing to put a timeline on the operation.

A Kenyan man was sentenced to life imprisonment Friday after he admitted involvement in a grenade attack and membership of the al-Qaida linked Somali Shebab militant group.

"This sentence is harsh because police have provided evidence showing he intended to hurt the public," said Judge Grace Macharia at the sentencing of Elgiva Bwire Oliacha. "It is also meant to be a deterrent," she added.

Attackers fired a rocket-propelled grenade at a vehicle and killed four people in northern Kenya Thursday, police said.

"The vehicle was carrying eight people but four of them have died," a police officer in the region said on condition of anonymity.

Grenade blasts at a blue-collar bar and a crowded bus stop rattled Nairobi, as the country worried whether al-Qaida-linked militants from Somalia were carrying out their promise to launch reprisal attacks in Kenya's capital.

The attacks on Monday came only two days after the U.S. warned of "imminent" terror attacks.