Nine rockets were fired at Pakistan's Military Academy (PMA) in Abbotabad early Friday, officials said.
District Coordination Officer Imtiaz Hussain Shah said that no one was hurt in the pre-dawn fire, Xinhua reported.
He told the media that nine rockets were fired at the Pakistan Military Academy at about 3:00 a.m. (local time) from hills near the Ilyasi Mosque area of Abbotabad town, a mountainous area located some 60 kilometers north of Pakistan's capital city of Islamabad
He said that three rockets hit the outer wall of PMA while six rockets fell in other areas near the Academy, however, no causality was reported in the attack.
The PMA is located near the town where Osama bin Laden was killed on May 2 by the U.S. military.
Shah said that the army and police launched a combined search operation in the area and hoped that the suspects would soon be arrested. He said the District Police Officer is heading the search operation and he will soon present a report.
"It is the work of terrorists," he said, adding that security is always on high alert in the area due to sensitive installations there.
"We are passing through such a situation and everyone knows who have done it," he said, when asked as to who may be behind the incident.
The incident happened hours after the Army Chief General Ashfaq Parvez Kayani visited Abbotabad, in connection with the Commanding Officers' Conference.
An army statement said the Commanding Officers' Conference on Thursday was a formal event for interaction between unit commanders and senior officers.
Talking on the occasion, Gen. Kayani appreciated the efforts of the "Frontier Regiment" in fighting militancy and the commitment and valour of its officers and soldiers.