Blasts at a boys' school in Kabul kill four people and injure many more.

At least four people were murdered and several more were injured in a suspected twin suicide explosion outside a boys' school in Kabul, Afghanistan's capital.

The explosions occurred at the Abdul Rahim Shahid high school in the city's Shia-dominated west. The number of those killed or injured is expected to climb.

A grenade strike was also launched against a nearby tutoring center.

There was no immediate admission of guilt. In the past, militants from the Islamic State have assaulted the area.

According to sources at Kabul's Muhammad Ali Jinnah Hospital, four people have died and 19 have been injured as a result of the school incident.

Students were leaving morning classes when the blasts happened, one witness told the AFP news agency.

Bloodstains on the ground and discarded notebooks may be seen in photos taken after the explosions.

Because of its predominantly Hazara Shia Muslim population, the area where the attacks occurred - Dasht-e-Barchi - has been a frequent target of attacks by the Islamic State's local branch.

Sunni militant groups routinely target Hazaras, an ethnic and religious minority who are seen as heretics by Sunni militant groups.

A hand grenade was also hurled into a neighboring tuition center for students studying for a university entrance exam, according to local sources.

Following a wave of IS strikes last year in the aftermath of the Taliban's takeover, the group's activity had slowed.

Over the last few years, IS has waged a deadly campaign against Shias in Afghanistan. Bombings against sports halls, cultural centers, and educational facilities have killed a large number of people.

In a May attack by IS on a girls' school in Dasht-e-Barchi, more than 90 pupils and staff were slain.