Islamabad, July 26 (DPA) Pakistani police Sunday said investigators were quizzing a former pro-Taliban lawmaker believed at the centre of the slaying of a Polish engineer by militants earlier this year.

Shah Abdul Aziz, who belongs to a right-wing Islamist party and has links with the Taliban, was remanded in custody Saturday.

'He (Aziz) is suspected of ordering the beheading of Polish engineer Piotr Stanczak,' police officer Mahmood Khan said.

The former parliamentarian had been missing since May, with aides alleging that he had been picked up by intelligence agents.

Aziz's whereabouts remained unknown until Saturday when he was produced in a special court in the garrison town of Rawalpindi along with another suspect, who had already been under detention since July 16.

Taliban militant Attaullah Khan confessed before the court that he and some other militants had kidnapped Stanczak and later killed him on the orders of Aziz.

Stanczak was abducted in September 2008 from the district of Attock, located near the insurgency-hit north-western region. In February the militants released a video showing his beheading.

Aziz was allegedly negotiating between the abductors and the authorities, and he ordered the killing when the Pakistani government refused to release 60 militants in return for the Pole.