A total of seven people have been injured in the blasts, police said.
"At first we thought it was a gas cylinder explosion, but later it proved to be homemade bomb (explosion). Most of the bombs exploded while they were being made. We suspect a splinter Maoist group formerly led by Netra Bikram Chand is behind it. We have recovered bundles of pamphlets of the party from two blast sites," a police official who is investigating the issue told ANI on the condition of anonymity.
The Police has arrested nine people from various locations in and around Kathmandu in connection with the blast.
The Government of Nepal recently blacklisted the splinter group for engaging in extortion and violent activities. The group has called for a strike on Monday to protest against the government's attempt to contain it.