A top Indian security official says a suspected bomb blast outside the High Court building in New Delhi Wednesday killed at least four people and wounded 24 others.

Home Ministry official U.K. Bansal said an explosive device hidden in a briefcase possibly caused the morning blast outside a gate leading to the court.

Indian television showed images of ambulances taking victims from the scene.

This blast is the second explosion at the High Court this year. In May, a small bomb exploded outside the same court, but did not cause any casualties.