At least two people have been killed and 13 injured in four suspected bomb explosions in Nepal's capital, Kathmandu, police say.
Two blasts were in crowded areas in the city centre, reports say. Some of the injured are said to be critical.
No group has so far claimed responsibility for the blasts.
Kathmandu has not seen any bomb explosions since Maoist rebels signed a landmark peace deal with the government in November and ended their insurgency.
Under the deal, the Maoists and the army agreed to place their weapons under supervision by the United Nations.
The blasts were all within minutes of each other, one hitting a minibus in the city and another a university campus outside it, police said.
It is not clear which blasts caused the fatalities.
The rebels denied carrying out the attacks.
"We think that it could be a conspiracy of those who want to stop the elections," rebel commander Ananta said, quoted by AFP news agency.
Nepal goes to the poll in November to choose a body to rewrite the country's constitution.