The blast happened in Salim Karwan area, a spokesman for city police said.
It was triggered by a roadside bomb, Ferdaws Faramarz said.
At least three people were injured in the explosion, said Marwa Amini, deputy spokesperson for Interior Ministry.
A second explosion went off in Taimani area of the city. Nasrat Rahimi, a spokesman for Interior Ministry, said that the blast was triggered by a roadside bomb, adding it left no casualties.
There was no immediate claim of responsibility for the bombings.
The blastscome as the country marks beginning of Martyrs Week.