Police in Pakistan say two people have been killed in the province of Punjab after the bomb they were carrying on a bicycle accidentally exploded.
Police say they hit a road bump on the outskirts of a town in the province.
Deputy Superintendent Bashir Ahmed said they did not know whether the two men intended to plant the explosives or to carry out a suicide attack.
Correspondents say Pakistan has suffered a series of suicide attacks in recent weeks.
The two men died near Chichawatni, 120km (75 miles) north of Multan.
There is speculation that they were intending to detonate the bomb at a large cattle market, which is being held in the town.