Indian police have detained four people, including an 18-year-old woman and her parents, over last week's twin car bombings that killed 52 people in Bombay.
Police suspect the four of being members of the Pakistan-based Kashmiri rebel group Lashkar-e-Taiba, blamed for several militant attacks.
The four are being held under India's tough anti-terrorism law and police have several months to lay charges.
A police spokesman said they found more than 200 sticks of explosives, detonators and alarm clocks when they detained the four: a husband and wife, their daughter and a man aged 26.
He said the four were held after the driver of a taxi used in one of last Monday's attack described to police three passengers who asked him to park at the Gateway, one of Bombay's most famous landmarks, while they went off for lunch on the day of the blast.
The Bombay attacks and a surge in violence in the disputed Kashmir region have cast a cloud over tentative peace moves between India and Pakistan, which almost came to war last year.
India accuses Pakistan of sponsoring militant violence in Kashmir and elsewhere, a charge Pakistan denies.