In 1998, India carried out the Pokhran-II nuclear tests which was followed by Pakistan's Chagai-I tests. Following the Lahore Declaration in February 1999, relations briefly improved. A few months later, however, Pakistani paramilitary forces and Pakistan Army, infiltrated in large numbers into the Kargil district of Indian Kashmir. This initiated the Kargil War after India moved in thousands of troops to successfully flush out the infiltrators. Although the conflict did not result in a full-scale war between India and Pakistan, relations between the two reached all-time low which worsened even further following the involvement of Pakistan-based terrorists in the hijacking of the Indian Airlines Flight 814 in December 1999. Attempts to normalise relations, such as the Agra summit held in July 2001, failed. An attack on the Indian Parliament in December 2001, which was blamed on Pakistan, which had condemned the attack caused a military standoff between the two countries which lasted for nearly a year raising fears of a nuclear warfare. However, a peace process, initiated in 2003, led to improved relations in the following years.