Indian police have arrested a fourth man on suspicion of involvement in the Mumbai explosions that killed more than 180 people this month, police said today.
Tanvir Ansari, a doctor of traditional Indian medicine, was picked up by the crime branch of Mumbai police late on Sunday. He is due to appear at a city court later today.
Three men, all Indian Muslims, were arrested last week for their alleged role in the rush-hour attacks that targeted first class carriages of Mumbai's commuter trains and platforms.
Investigators say the Pakistan-based Islamist militant group Lashkar-e-Taiba and Pakistani military spy agency Inter-Services Intelligence were the prime suspects in the case.
Islamabad has rejected the charges as unsubstantiated and has offered to help New Delhi in the investigations.
