New blast in Kabul follows attack that killed at least 28

Afghan security forces inspect the site of suicide car bomb attack on a government security building in Kabul, Afghanistan April 19, 2016. © Ahmad Masood
A second huge explosion has reportedly hit Kabul, hours after a suicide bomber killed at least 28 people and injured over 300 not far from the US embassy in the Afghan capital.

READ MORE: At least 28 killed, 327 injured in Kabul suicide blast claimed by Taliban

The exact location of the new explosion is not yet known, but witnesses told Reuters they heard the sound of sirens across the city.

Twitter users have described the blast as “big” and “loud.”

The explosion reportedly took place in the affluent Wazir Akbar Khan neighborhood in northern Kabul, near the compound of Afghan warlord Abdul Rashid Dostum, LPD Afghanistan said on Twitter.

A police source told BBC journalist Kawoon Khamoosh that the blast hit the Shirpor district and was caused by an improvised explosive device.

Afghan journalist Bilal Sarwary cited a police officer who said that "a sound bomb was placed close to a Shisha shop in Shirpor to create panic. Two people injured with broken glass."

Earlier on Tuesday, a huge explosion has rocked Wazir Akbar Khan district not far to the US embassy, and several Afghan government ministries and security agencies.

READ MORE: At least 28 killed, 327 injured in Kabul suicide blast claimed by Taliban

At least 28 people have been killed in the attack, AFP cited local police chief, while the Health Ministry confirmed 327 injured.