According to Sputnik's sources in Afghanistan, 16 people are dead, with at least 28 injured. A number of hostages have been taken.
One of the gunmen has reportedly been shot by police, and Afghan Interior Ministry spokesman Sediq Siddiqui has described the situation as "under control."
Earlier on Tuesday, armed suicide bombers attacked a mosque in the Afghan capital, taking hostages.
"The US Embassy in Kabul has received reports that several heavily armed suicide bombers entered Karte Sakhi Mosque (PD-3) and may have opened fire on parishioners," reads a statement from the US Embassy in Kabul.
Parishioners had gathered at the mosque ahead of the Shiite holy day of Ashura Day, mean to end a month of mourning over the death of the Prophet Muhammad's grandson. Police had warned beforehand of the possibility of an attack.
