A driver and two others were killed in a road accident in Sadar area of the district this afternoon.
However, identities of the deceased could not be known immediately.
Police said a truck hit a roadside tree of the Sylhet-Sunamganj road as its driver lost control over the steering leaving three people including truck driver dead on the spot.
The bodies were sent to Sylhet MAG Osmani Medical Hospital morgue for autopsies.
Shafiqul Islam, officer- in-charge of Jalalabad police station, said police seized the truck.