Police are probing possible links between Tuesday's serial blasts in suburban trains, which killed at least 90 people, and the seizures of radio-enabled detonators in Mumbai in March and a huge consignment of RDX at Aurangabad in May.
The Anti-Terrorist Squad of Mumbai Police busted two suspected modules of the Lashkar-e-Taiba following the seizures, but said it had been unable to find out whether similar modules were still active in the city and if they had plans to carry out attacks in Mumbai.
Police are now focusing on finding out if the persons arrested in connection with the two modules had any knowledge of Tuesday's terror attacks in suburban trains, sources said.
The ATS had earlier claimed the arrests made by it had helped avert a major terrorist attack on Mumbai.
On May nine, ATS sleuths seized a consignment of 30 kg of RDX explosives and arms and arrested over 10 suspected Lashkar operatives at Aurangabad in Marathwada region, 350 km from Mumbai. The consignment included 10 AK-47 assault rifles and 2,000 cartridges.
Subsequently, seven more persons were arrested and 13 kg of RDX and six AK-47 rifles were seized from different locations in central and northern Maharashtra.