Investigators working on the Mumbai terror attack have unearthed vital information about how the terrorists managed to enter Mumbai.

The interrogations of the two arrested terrorists, Abu Ismail and Ajmal Kamal, have revealed that 20 men were involved in the terror attack. While eight terrorists set up base in Hotel Trident and Taj Mahal Hotel [Images], 12 others came to Mumbai in a boat.

Intelligence Bureau officials are trying to verify if the terrorists came in through the Persian Gulf.

The arrested terrorists have revealed that they hijacked two fishing boats and used them to come to Mumbai, armed with guns and ammunition.

He further stated that while one of the boats landed at Cuffe Parade near the fishermen's colony, the other landed at Sassoon dock.

The terrorists had initially planned to send in only one team to carry out the attacks and the other team was to be kept on stand-by.

However, the plan changed at the last minute, and the terrorists decided to execute the terror attacks together, Ismail reportedly told the police.

According to the officials of the Intelligence Bureau, the attacks had been planned in  February, and this fact was confirmed by an arrested accused in the CRPF camp attack case. The accused had revealed that a Fidayeen attack had been ordered by the Lashkar-e-Tayiba and the target was Mumbai.

The accused had told the police that the LeT planned to attack the Taj Mahal Hotel and the Bombay Stock Exchange.

During his interrogation, Ismail admitted that he and his associates had undergone rigourous training for this operation, which had been planned meticulously.

Investigating officials are not ruling out the possibility of local elements providing logistical support to the terrorists.

Ismail further told the investigators that the terrorists had undergone extensive training in using AK-47 and grenades at a camp in Pakistan occupied Kashmir.

During the training programme, they were shown the detailed layout of the Taj Mahal Hotel, in order to acquaint them with the topography of the places they would have to attack. After the training at PoK was complete, the entire team was shifted to Karachi, where they received training in sailing as their plan included entering India through the sea route.