MUMBAI, July 15: Hundreds of investigators questioned suspects and scanned international telephone calls made after this week’s deadly Mumbai blasts on Saturday.

Police sources said about 400 officers and men were involved in the mammoth hunt to find those behind the serial bombs that struck the Indian financial hub’s commuter trains and stations, killing 200 people.

They were trying to find leads in several calls made to Pakistan, Afghanistan and Bangladesh from public booths, but so far not much headway has been made, the sources said.

No suspect has been officially named or arrested but hundreds of people have been questioned and dozens detained since Tuesday’s explosions.

Indian newspapers and news television channels published photographs of two people they said were among three top suspects, but police denied having named anyone.

However, police have made sketches of three other suspects seen at sites of the attacks.

Although there has been no breakthrough in the probe, Indian officials have said Lashkar-i-Taiba and Pakistan’s Inter-Services Intelligence are the prime suspects.

In the meantime, survivors of the bombings, some of whom Singh met on Friday, have begun returning home from hospitals.—Reuters