Mourning and despair are sweeping through the Indian state of Odisha after a tragic train accident that killed at least 300 people and injured more than a thousand this Friday in what is considered the country’s worst railway tragedy.

The accident occurred when two passenger trains and one freight train collided and derailed.

Indian Prime Minister Narendra Modi was shocked by the tragic incident and expressed his condolences to the affected families.

Rescue operations are underway at the crash site, all possible assistance is being provided to the victims, Modi wrote on Twitter.

Later, he visited the scene and said that those responsible for the accident would be severely punished. It is not yet clear what caused the collision of trains in the Balasore area.