At least four gunmen have been killed in an overnight attack on an Indian air force base.
Officials said that two soldiers at the Pathankot base were also killed in a gun battle lasting several hours.
Operations at the base continued with some reports saying gunmen were holed up in the base.
The incident came days after the Indian and Pakistani leaders, Narendra Modi and Nawaz Sharif met in Lahore to launch a surprise peace initiative.
The whole of India’s Punjab state has been placed on alert.
The base is on the main highway leading to Indian-administered Kashmir.
In August, seven people were killed in a similar attack when gunmen stormed a police station in nearby Gurdaspur district.
The three attackers in Gurdaspur were killed after a 12-hour standoff with police.
Pathankot air force base is about 430km (270 miles) north of the Indian capital, Delhi and is on the road linking Indian-administered Kashmir with the rest of the country.
Indian-administered Kashmir has seen a long-running insurgency against rule from Delhi, and Kashmir has been a flashpoint in relations between Pakistan and India for nearly 70 years since independence.
