SINGAPORE (Reuters) -Pakistan and India are close to reducing the troop build up along their border to levels before conflict erupted between the nuclear-armed neighbours this month, a top Pakistani military official told Reuters on Friday, although he warned the crisis had increased the risk of escalation in the future. The spark for the latest fighting between the old enemies was an April 22 attack in Indian Kashmir that killed 26 people, most of them tourists. New Delhi blamed the incident on "terrorists" backed by Pakistan, a charge denied by Islamabad.