Kolkata, Nov 16 (IANS): Welcoming the decision to cut petrol prices by Rs.1.85 per litre as a "positive step", Trinamool Congress supreme and West Bengal Chief Minister Mamata Banerjee Tuesday said she was very much concerned about the prices of cooking gas and kerosene.

"It is a positive step. We are happy about it," Banerjee told reporters.

Earlier this month, Trinamool -- the second largest ally of Congress-led United Progressive Alliance (UPA) -- had threatened to pull out of the government over its dissatisfaction over repeated hike in petrol prices.

Giving a temporary reprieve to the Congress, Banerjee had then said her party would not stay with the central government if price of kerosene, diesel and cooking gas was raised yet again as the Prime Minister Manmohan Singh was non-committal on the issue of further hike in the prices of petroleum products.

"We are very much concerned about the prices of domestic gas, kerosene and diesel," said Banerjee Tuesday.