Police in India are hunting for clues as to who was behind Tuesday’s deadly bomb attacks on Mumbai’s train network that killed at least 183 people and injured over 700. The near-simultaneous blasts happened at the height of the evening rush hour. Seven explosions ripped through commuter trains and stations within 15 minutes of each other. The blasts all happened in fast trains and inside first class carriages. Train cars were blown apart and witnesses reported body parts littering the railway tracks. Television images showed footage of bystanders carrying victims in the rain to ambulances and searching through the wreckage for survivors and bodies.

• Unidentified eyewitness: “I heard a loud noise like a bomb blast and after that, luggage and everything fell on me and everyone started running. It was a chaotic situation. Due to the blast, the trains are not running and people are stuck inside the trains and can’t get home.”

Hundreds of thousands of people were stranded overnight after the trains shut down. An eighth bomb was reportedly defused in a Mumbai suburban station. The attacks are the worst in Mumbai for more than a decade.