The attacker threw three hand gernades at the sessions court of which one exploded, while a car parked in the vicinity also caught fire.
Police said that the gunman was trying to free the prisoners from the judicial lock up when the police cordoned off the session court.
Heavy police contingent was also called on to control the situation.
The lawyer killed was identified as advocate Mehboob, while the police termed the incident as a matter of court enmity.
Lahore High Court Chief Justice Khwaja Muhammad Sharif has taken a suo moto notice of the attack.
CCPO Lahore Chaudhry Shafique says the attacker was killed on the spot by a policeman, while lawyers present at the location claimed that the police were nowhere near when the incident took place and that the assailant was gunned down by a civilian.
Lawyers also started demonstrating at the scene of the attack.
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