India's foreign minister denied Sunday that he had phoned Pakistan's president at the height of the Mumbai terrorist siege, prompting its air force to go on high alert, but Pakistani officials insisted he - or someone else in his ministry - had placed the call. Pakistani Information Minister Sherry Rehman said President Asif Ali Zardari received a "threatening" call during the crisis that definitely came from India's External Affairs Ministry. She did not explicitly say the call was from the foreign minister, Pranab Mukherjee, but two other government officials said it was from Mukherjee. They spoke on condition of anonymity because of the sensitivity of the situation. Pakistan's media first reported the phone call on Saturday but described it as a hoax.