NEW DELHI, Dec. 22 -- In signs of growing regional tension since the Mumbai attacks last month, Pakistan scrambled fighter jets over several of its larger cities Monday, and India's foreign minister told a gathering of Indian diplomats in New Delhi that the country is keeping all its options open to bring the perpetrators of the attacks to justice. "We have so far acted with utmost restraint," Pranab Mukherjee told the more than 120 envoys from posts around the world, according to news reports. But he added, "We will take all measures necessary as we deem fit to deal with...