Twelve people were killed and five others injured Friday in a suicide attack on a police station in Tirinkot, capital of the southern province of Uruzgan, the Afghan press reported.

The assault took place at midday as the officers were eating, provincial government spokesman Abdullah Hemmat told the AIP news agency.

Most of the dead were uniformed officers, though some civilian police employees also died, according to Hemmat, who said the death toll could climb.

The bomber was wearing a police uniform, AIP said, citing sources who spoke on condition of anonymity.

There has been no claim of responsibility for the attack in Tirinkot, which came hours after another suicide bomber killed five police and three civilians on Afghanistan's border with Pakistan.

The blast occurred in the Chaman-Spin Boldak pass, a route used every day by thousands of civilians as well as by NATO convoys bringing supplies into Afghanistan.

The number of Afghan police killed in May, 299, marked a 22 percent increase over the same month in 2012, Interior Ministry spokesman Sediq Sediqi said recently.

Foreign troops deployed in Afghanistan with the NATO-led International Security Assistance Force are due to withdraw by the end of 2014. EFE