Pressure mounts on Mumbai cops to produce results

Officers declined to give names or details of those they were looking for amid growing complaints over the failure to make any arrests five days after Tuesday's rush-hour blasts.

"We have a couple of suspects. We're not giving their names," additional commissioner of police Jayjit Singh, responsible for the anti-terrorist squad, told AFP.

But he added officers were investigating many groups and individuals. "We're looking at so many people, so many theories are in mind," he said.

Seven blasts went off within 15 minutes of each other along Mumbai's western railway line on Tuesday evening, tearing open first-class train carriages packed with rush-hour commuters.

Some 25 people had come forward with information about "suspicious-looking men" but conflicting descriptions had made it difficult for the police to zero in on suspects, the NDTV news channel reported.

Mumbai police said they had picked up hundreds of people from different areas of India's financial capital for questioning. Eleven held after a pre-dawn swoop Saturday were for minor crimes like theft and burglary, reports said. Police said "targeted" swoops were continuing.