At least five Afghan police officers died Monday morning when a fellow officer opened fire on them as they were sleeping at a control post in the northern province of Jawzjan, a police source told Efe.

The attack occurred around 5 a.m. (0030 GMT) in the Qush Tepa district, according to the head of the provincial police, Abdul Aziz Ghairat, who added that the shooter was an "undercover Taliban."

"According to our investigation, (the attacker fled to) the Taliban after the incident," the source added.

Taliban spokesman Zabiullah Mujahid claimed responsibility for the deed in the name of the insurgent movement.

Mujahid told the local AIP news agency that the Taliban movement had been advised that the attack was going to be carried out.

Last Wednesday, in a similar incident, four Afghan police were killed and three more were wounded when a fellow officer shot them after poisoning them at a frontier police post in the southern province of Kandahar.

Generally, the attackers in these incidents are Taliban who have infiltrated the Afghan security forces, although there have also been cases of score-settling or of soldiers who violently turn on foreign troops stationed in Afghanistan. EFE