Police in India arrested four more people suspected of playing a role in the July 11 train bombings that killed more than 200 people, a top investigator said Friday.

The four men were brought to a court in Mumbai, where the judge ordered them held in police custody until Oct. 13, said K.P. Raghuvanshi, who heads Mumbai's anti-terror squad.

He said authorities suspect that they have links to Islamic militant groups. But he did not elaborate on why police suspected the four of involvement in the blasts.

Police have so far arrested 14 people and questioned hundreds since the attacks in which seven bombs ripped through suburban trains. Mumbai, India's financial and entertainment capital, was formerly called Bombay.

Indian police have said that they believe the Pakistan-based Islamic militant group, Lashkar-e-Tayyaba, was responsible for the blasts and that it was assisted by the Students Islamic Movement of India, a banned Islamic group.

Pakistan denies any involvement in the terror attack that killed at least 207 people and injured another 700.

Lashkar-e-Tayyaba is one of the Islamic groups fighting since 1989 for Kashmir's independence from India or its merger with Pakistan. More than 68,000 people have been killed in the conflict.