Safari hii lile kundi la Al Shabab limelipua bomu kwenye basi na watu 8 wamepoteza maisha mpaka sasa
Attack near Kenya-Somalia border 'kills four'
Kenyan police secure the scene of an explosion in the Kenyan capital Nairobi 24 October 2011 Police in the capital are on a heightened state of alert
Armed men have attacked a lorry near Kenya's border with Somalia, killing at least four people, reports say.
The lorry was carrying school examination papers when it was attacked in Mandera district, reports say.
Kenya blames Somalia's militant Islamist group al-Shabab for a spate of abductions on its territory.
Al-Shabab denies the allegation and has vowed to take revenge against Kenya for sending troops into Somalia.
Kenyan Red Cross spokeswoman Nelly Muluka-Oluoch told the AP news agency that Red Cross staff who went to the site of the attack reported four deaths.
The attackers fired machine guns and rocket propelled grenades at the vehicle, which was carrying school examination papers, AP says.
Grenade blasts
Kenyan police spokesman Eric Kiraithe described it as a "banditry attack" about 110 km (70 miles) from Mandera town, the Reuters news agency reports.
He said government officials were among the passengers.
Kenya sent hundreds of troops into Somalia on 16 October to attack al-Shabab, which is linked to al-Qaeda.
Al-Shabab has repeatedly threatened retaliatory attacks on Kenya.
On Wednesday, a Kenyan man arrested after two grenade blasts in the capital, Nairobi, admitted in court to being a member of the group.
Elgiva Bwire Oliacha pleaded guilty to carrying out the attacks on a nightclub and bus stop.
One person was killed and 29 others were wounded in the attacks on 24 October.
Security has been stepped up in Nairobi since the blasts, with many residents fearing there could be more attacks, correspondents say.
Last week, the French authorities said a Frenchwoman suffering from cancer who was kidnapped from Kenya by Somali gunmen earlier in the month had died.
Other foreigners abducted from Kenya and being held in Somalia include a British woman abducted from a coastal resort, and a Kenyan driver and two Spanish aid workers seized from the Dadaab refugee camp near the Kenya-Somalia border.
BBC News - Attack near Kenya-Somalia border 'kills four'
Mbona wanasema watu wanne tu?!