Kenya: Four killed in attack close to the Somali border

Gunmen have ambushed a vehicle in Kenya near the border with Somalia, killing four people, reports say.

A school teacher and a government official were among the dead as the attackers fired a rocket-propelled grenade, police said.

Kenya blames Somalia's militant Islamist group al-Shabab for a spate of abductions on its territory.

Al-Shabab denies the allegations and has vowed to take revenge against Kenya for sending troops into Somalia.

The BBC's Africa correspondent Andrew Harding reports from Nairobi.