By: John Roberts
The explosion occurred in the northern province of Sar-e-Pul, the news media reported.
Authorities said the pregnant woman and four members of her family, including two children, were killed in the blast and two others were wounded.
No further details were reported.
The Interior Ministry blamed the incident on the insurgents, saying: "The civilian population is a clear sign of the weakness for the insurgents. Such attacks cannot weaken the spirit of cooperation between our people and security forces."