According to Tolo News, citing a source in the security service, six people were killed, five more were injured.

یک منبع امنیتی تأیید می کند که در انفجار در حوزۀ ششم امنیتی شهر کابل ۱۸ تن جان باختند و بیش از ۱۰۰ تن دیگرر،زخ pic.twitter.com/LW2SFC2GXe

- TOLOnews (@TOLOnews) August 7, 2019

Meanwhile, another source reported 18 dead and more than 100 wounded.

At least 18 people were killed and over 100 others were wounded in a car bomb attack in #Kabul on Wednesday morning, a security source said. # Afghanistanpic.twitter.com / y0haw3tz0O

- TOLOnews (@TOLOnews) August 7, 2019

According to preliminary data, the explosive device was in the car.