Dhaka, Sept. 3 -- The country's fragile consensus over sweeping constitutional and political reforms has begun to unravel, with deepening divisions among the country's leading parties on how to implement the much-discussed July Charter.

The disagreement has amplified uncertainty over the timing and credibility of the next national election, which several leaders warn must be held by February to avert crisis.

At the heart of the dispute lies the question of whether the Charter - a blueprint for reforms born out of last year's mass uprising - should be given immediate legal standing, or left for the next elected parliament to implement.

The Bangladesh Nationalist Party (BNP) has argued strongly for the latter, insisting that constitutional...