Heavy gunfire and multiple explosions have been heard from Kabul's military academy.  

According to eyewitnesses, a series of explosions hit an area near the Marshal Fahim military academy in the Afghan capital early on Monday morning.

An Afghan security source said that unknown gunmen attacked the academy but were not able to enter the facility, adding that some of the attackers were killed.

The incident comes just two days after a deadly car bomb attack hit near foreign diplomatic missions and government buildings in the city, claiming the lives of over 100 people.

Many parts of Afghanistan remain plagued by militancy despite the presence of thousands of foreign troops.

The United States -- under Republican George W. Bush’s presidency -- and its allies invaded Afghanistan on October 7, 2001 as part of Washington’s so-called war on terror.

The offensive removed the Taliban from power, but insecurity continues to rise across Afghanistan.