According to Pakistani police, a suicide bomber attacked a group of police officers on Thursday in Lahore killing at least 21 people and injuring other 39.

The accident occurred just outside the high court where hundreds of police officers were gathered waiting for a protest by lawyers.

The attacker was asked by police to stop his motorcycle outside the court, AFP reports. That’s when he detonated the bomb taking the lives of almost 21 people, including police officers.

The bomb went off on the GTO Mall road, around 11:45 a.m., just outside the Lahore High Court a few minutes before the lawyers were about to start protesting against the rule of Pakistani President Pervez Musharraf, according to CNN.

Senior police officer Malik Mohammad Iqbal said that the head of the bomber was found at some distance from the place of the explosion.

The site of the blast was filled with victims lying on the street.

Aftab Cheema, senior superintendent of police in Lahore, said: "A man came on a motorcycle and police stopped him when he approached the police post, then he blew himself up. Most of the casualties were policeman. There were a large number of police posted outside (the court) because the lawyers had planned a rally against the government today.”

Nobody claimed the responsibility for the attack yet.

The attack comes just two weeks after Benazir Bhutto’s assassination in Rawalpindi in a suicide attack which claimed the lives of other 20 people.

In the last year over 800 people have died due to attacks, many of them suicide bombings, thus making 2007 the deadliest in Pakistan’s history.