Updated

An Afghan official says the official death toll from last week's militant assault on a Kabul military hospital has risen to 50.

Officials originally set the death toll at 30 for the March 8 attack. But Gen. Helaludin Helal, the deputy defense minister and head of the team investigating the attack and its aftermath, released the new number in a press conference Wednesday.

The attack was claimed by the Islamic State group. Helal said there were five attackers in total: one suicide bomber who detonated an explosive belt and four gunmen who stormed the building.

Helal said 24 people have been arrested and are under investigation — either for involvement in planning the attack or dereliction of duty in failing to prevent it.