A spokesman for NATO forces in the area says it happened late on Thursday evening.
Early reports suggest at least one person has been killed and many more are injured.
The Taliban have said they planted the device. According to Euronews
According to NATO sources the explosion was followed by gunfire. According to German military sources and Reuters.
The explosion broke the windows of the neighboring buildings. NATO forces are in place to deal with the situation
The Blast was so stong that broke glasses of all buildings in the city # Mazar explosion pic.twitter.com/xn2YAvkHUN— Ehsan (@ehsan_af) 10 novembre 2016