Medical staff members move a wounded youth on a stretcher inside a hospital in Kabul on Tuesday. AFP

Explosions targeting educational institutions killed at least six people, including students, and injured 11 on Tuesday in a mostly Shiite neighbourhood of Afghanistan's capital city, police said.

The blasts, which occurred in rapid succession, were being investigated and more casualties were feared, according to Kabul police spokesman Khalid Zadran and the city's Emergency Hospital. Several of the wounded were in critical condition.

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The explosions occurred inside the Abdul Rahim Shaheed High School and near the Mumtaz Education Center several kilometres (miles) away, both in the predominately Shiite Muslim neighbourhood of Dasht-e-Barchi, with social media showing grisly images from the Hazara Shiite neighbourhood.

There were no immediate reports of casualties at the Mumtaz Center.

Guards in the narrow street leading to the two-story high school said they saw 10 casualties. Inside the school, an Associated Press video journalist saw walls splattered with blood, burned notebooks and children's shoes.

The number of bomb blasts in the country has significantly declined since the Taliban ousted the US-backed Afghan government in August, but the jihadist Islamic State group has claimed several attacks since then.