Kamal Hyder reports on the Lahore attack
The lawyers had been due to protest against the rule of Pervez Musharraf, the Pakistani president.Syed Imtiaz Hussain, a police officer who suffered wounds to his legs and groin, said: "There were about 60 to 70 policemen on duty when a man rammed into our ranks and soon there was a huge explosion.
"I saw the bodies of other policemen burning. It was like hell."
Motorcycle bomber
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,"
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The blast comes two weeks after the assassination of opposition leader Benazir Bhutto in a gun and suicide bomb attack in the northern city of Rawalpindi.
In 2007, more than 800 people were killed in attacks, mainly suicide bombings targeting the security forces.
The majority of those attacks have taken place since July, when the army raided a pro-Taliban mosque in the capital Islamabad, killing at least 100 people.