No one immediately claimed responsibility for the separate bombing and shooting in the Afghan capital.

The Taliban issued a quick statement denying any responsibility for the attack.

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After opening fire, the two gunmen holed up in a half-finished apartment building, leading to a five-hour standoff with security forces.

The first bomb was attached to bus carrying university students, and was followed 20 minutes later by two roadside bombs in the same area.

The attack began in the afternoon when a suicide bomber blew himself up in a car outside the public works ministry.

A coordinated double suicide bombing by the Islamic State group hit central Kabul on Monday morning, killing at least 25 people, including nine journalists, officials said. An AFP photographer and a cameraman for a local TV station were among the fatalities, the police said.

The attacker used an ambulance to get through a security checkpoint, telling police he was taking a patient to a nearby hospital, and detonated his explosives at a second check point.

Gunmen attacked Kabul's Intercontinental Hotel on Saturday, seizing hostages and exchanging gunfire with security forces as the building in the Afghan capital caught fire and residents and staff fled.

The Islamic State group affiliate in Afghanistan has claimed responsibility.