By Ahmed Rasheed BAGHDAD (Reuters) - Iraq's defense minister criticized the United States on Sunday for declaring a timeframe for an offensive to recapture the Islamic State's northern stronghold of Mosul, saying military commanders should not show their hand to the enemy. Khaled al-Obeidi said the timing of the Mosul assault was for Iraq to decide, and that a U.S. Central Command official who predicted the attack was likely to take place in April or May had no knowledge of the issue. Islamic State fighters seized Mosul last June as they swept through northern Iraq towards Baghdad, meeting virtually no resistance from the army and establishing a self-declared caliphate straddling the border between Iraq and Syria.