The incident took place between the entrance and the parking of the court compound amid fears at least 12 people were killed, Khaama Press reported.
The explosion has left 38 others injured.
A spokesman for the Ministry of Public Health Waheedullah Mayar confirmed to Khaama Press that around 20 people were killed and around 38 others were wounded in the explosion.
No group has claimed responsibility of the explosion so far.
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