Indian authorities have issued a terror alert in the national capital in the run up to the Republic Day Sunday, a senior police official said Friday. "The terror alert has been issued following specific intelligence inputs that Pakistan-based militant outfits like Lashker-e-Toiba and home-grown Indian Mujahideen may carry out serial lasts in the Indian capital on January 26," he said, on condition of anonymity. Sleuths from the Delhi Police and the Intelligence Bureau recently met the country's defense officials to discuss the security arrangements in the national capital, he said. "Some 10,000 security forces personnel will be manning the Indian capital Sunday and security at the Indira Gandhi International Airport has also been stepped up. The efforts are to avoid any kind of untoward incident during the Republic Day celebrations," the official added. India had suffered a massive jolt during the 2008 Mumbai terror attacks when some 10 Pakistani militants entered through sea route and carried out a mayhem in the financial capital, in which over 170 people were killed and more than 300 others injured.