Prime Minister Manmohan Singh today expressed deep concern over the sharp rise in onion prices and said effective steps should be taken to bring down the prices to affordable levels. In a letter to the secretaries of Departments of Consumer Affairs and Agriculture, Dr.Singh has expressed deep concern over the extraordinary price rise. The Prime Minister wanted that steps should be taken expeditiously and the impact should be monitored on a day-to-day basis. Sources said, the Prime Minister's letter also made references to the wholesale and retail prices.Meanwhile, the government on Tuesday said, the skyrocketing onion price is likely to come down in two – three weeks. Agriculture Minister Sharad Pawar said, the situation is likely to improve thereafter in the wake of its move to ban exports of the commodity.Mr. Pawar, however, ruled out any immediate plans to import onions to arrest prices even though small consignments arrived from Pakistan. Explaining the reason for the onion price rise, Mr. Pawar said, a substantial quantity of onion has been damaged because of the heavy rains in the Nashik area, the biggest producing centre. Finance minister Pranab Mukherjee said that supply needs to be streamlined.Meanwhile, NAFED Managing Director Sanjeev Chopra told AIR that its outlets will sell Onions in Delhi between 35 to 40 rupees a kg. This, he said, will help in stabilising the prices.