Story highlights Death toll now stands at 64, authorities say

Suicide bombing rips open back wall of building, official says

Gunman who entered building later killed, he says

(CNN) The death toll from an explosion in the Afghan capital rose to 64 people Wednesday, authorities said, a day after militants targeted civilians in Kabul.

The blast rocked Kabul on Tuesday morning -- the apparent work of Taliban militants targeting a security team that protects government VIPs, a police official said.

In addition to the deaths, more than 300 people were wounded, Interior Ministry spokesman Sediq Sediqi said

Despite the target, most of the victims were civilians -- including women and children, according to Sediqi.

A suicide bomber detonated a vehicle filled with explosives in a private parking lot behind the compound, destroying the back wall of a building, according to Sediqi.