Pakistani security agencies have started a high level of investigation about the assassination of Punjab governor Salman Taseer who was killed by one of his security guards on Tuesday afternoon in capital Islamabad.

Salman Taseer, wrapped with the Pakistani flag, during his funeral procession in Lahore, Pakistan, Wednesday, Jan. 5, 2011. Thousands of Pakistani police were on high alert in Lahore on Wednesday ahead of the funeral for an outspoken provincial governor shot dead by a bodyguard reportedly enraged by his opposition to laws decreeing death for insulting Islam.[Xinhua/AFP Photo]

According to official sources, police has arrested 36 policemen of Elite force and special police branch who were responsible for the security arrangements of Taseer.

Just after the incident police raided the official room and house of the killer, confiscated the luggage under his use and also arrested his nine close relatives.

Shaharyar, son of the governor, registered a case against the murder at the Kohsar Police station in Islamabad against the killer.

Pakistan's federal minister Reman Malik talking to media told that he had formed a three member investigation committee consisting of higher level police officer.

"Investigation team will check whether it was his (killer) individual planning and attempt or there was any conspiracy behind this brutal act," said Malik.

Police presented the killer before the judicial magistrate in his court in Islamabad and requested for the five days judicial remand. But magistrate Naeem Shaukat denied the said remand and gave only one day remand ordering to present the murderer in the anti-terrorism court which is bound for quick prosecution.

Governor Taseer, 64 years old, was assassinated by his bodyguard Mumtaz Qadari, aged 26, with AK-47 gun when he was about to sit in his car after his lunch with a friend at a market in the downtown area of Islamabad.

Qadari fired whole magazine having 30 bullets at governor out which 27 rounds hit the deceased's head, face, neck, chest and belly, medical postmortem report confirmed it.

Following the attack, the assassin laid down his gun and surrendered himself to the rest of the policemen escorting the governor.