IMPHAL: Over 500 goods-laden trucks and oil tankers reached Imphal on Monday along NH-37 ( Imphal-Silchar Road ) under security escorts even as the opposition BJP raised a host of questions on the current situation.Senior BJP spokesman N Biren Singh termed the arrival of the trucks and oil tankers a faalout of the strong initiative taken by the central government.A combined security team, mostly CRPF personnel, escorted the trucks. The arrival of the vehicles gave respite to people who bore the brunt of the United Naga Council (UNC) sponsored economic blockade, which entered its 56 th day on Monday.Prices of almost all essential commodities, particularly food items, have soared, while edible products, mobile phones, motor parts and household items are running out of stock.Of the total trucks that reached Imphal here in the afternoon, 43 were loaded with LPG cylinders, 48 carried fuel, 10 (rice), 2 (medicines) and the rest essential items. Two truck loaded with EVM machines for the coming assembly polls were also included in the convoy.Another 550 loaded trucks and oil tankers are still stranded in Jiribam district bordering Assam. They are likely to be escorted back to Imphal in the next few days.Meanwhile, 90 Imphal-bound passenger buses are still stranded in various parts of the northeast following the violence in the state. The All Manipur Inter-state Buses and Allied Transport Service Association on Monday urged the state government to do the needful to bring back the passengers and drivers.BJP leader N Biren Singh has charged the state government with engineering a divide-and-rule policy on the face of the tense situation.He was one of the state BJP delegation members who held a crucial meeting with Union home minister Rajnath Singh in New Delhi on the crisis in Manipur due to the UNC-sponsored blockade.Among other things, the team told the Centre that NSCN(IM)'s framework agreement should be confined only to Nagaland."As the ceasefire agreement with NSCN(IM) has not been extended to Manipur, has the state written to the Centre about the presence of the outfit's camps with a request to flush them out from the state," he questioned.Biren Singh further asked whether the state government has provided any proof to the Centre that NSCN (IM) was behind the recent attack on the state police in hill districts in which three policemen were killed and 13 others were injured.He said the central forces have failed to take action against NSCN (IM).