Officers of public sector oil companies today threatened to go on an indefinite strike starting August 29 if the government did not honour their demand for higher wages."We may launch an indefinite strike from August 29 if our demands are not met," Oil Sector Officers' Association (OSOA) convenor Ashok Singh said.Public sector oil employees are demanding periodic pay revisions every five years, 100% Dearness Allowance neutralisation with effect from January 1, 1996, 50% DA merger, and immediate release of additional stagnation increments.OSOA is a representative body of executives of 12 public sector oil firms.The association is also seeking an entry-level salary of Rs 50,000 per month (from Rs 20,000 at present) for management trainees and commensurate rise in emoluments at senior levels.Singh said that the core group of OSOA is meeting later today where the date of the strike will be finalised.Earlier today, OSOA members were detained by the police as they marched towards the Prime Minister's Office to submit a memorandum demanding higher wages.About 100 officers were going from the Press Club to South Block to submit a memorandum to Prime Minister Manmohan Singh when they were detained.Prohibitory orders are in place in the area as it is a high security zone, police officials said.