At least three Kenyan police officers have been killed when their vehicle hit a landmine near the country's eastern border with Somalia, according to a senior official.

The officers were part of a three-vehicle early morning patrol heading to the border town of Liboi when their truck hit an improvised explosive device (IED), North Eastern regional commissioner Mohamud Ali Saleh told the Reuters news agency.

Somalia's al-Shabab armed group claimed responsibility for the attack.

"We destroyed the police car. Some died and others were injured," Abdiasis Abu Musab, al-Shabab's military spokesperson told Reuters news agency.

The Kenyan Red Cross said on Twitter eight officers had been wounded.

Al-Shabab, which is fighting to overthrow the internationally recognised Somali government, has launched a series of deadly incursions in neighbouring Kenya, which has contributed troops to the Somalia-based African Union peacekeeping force.

The latest attack came just a day after Joseph Bionnet, inspector general of police, warned that some members of the armed group had sneaked into Kenya and were planning attacks.

"The militants have found it difficult to carry out attacks as they used to because all the entry points along the border have been closed. They have now resorted to planting IEDs at selected roads just to target our security officers," Saleh said.

Repeated attacks in Kenya by al-Shabab have killed hundreds of people in the past few years and hurt the country's vital tourism industry.

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Source: News agencies