Three main opposition parties on Tuesday staged walked out of the National Assembly session against current hike in petroleum prices, report said. The government on Monday increased by 9.9 per cent the prices of all petroleum products in a bid to pass on the partial impact of the steep rise of international oil prices. PML(N), PML(Q) and MQM staged token walk out from the NA session. Talking to newsmen outside the parliament house, MQM leader Haider Abbas Rizvi said despite assurance by the Prime Minister Syed Yousuf Raza Gilani that the fuel price issue would be presented before a parliamentary committee, the promise was not fulfilled. The fresh raise is a heavy burden inflicted on poor masses already suffering from economic worriesthis will not be accepted, he said.