The projects include diplomatic buildings, procurements for the railway, and highway development
No case has been reportedly filed over Friday's murder until Saturday afternoon.
Five men, arrested over the murder, are being questioned, Bogra's Assistant Superintendent of Police Ujjal Kumar Saha said.
Rehan, 38, was stabbed by miscreants who attacked the ruling Awami League's Bogra office on Friday evening. He died at hospital.
Two rival Sainik League factions were at loggerheads since the formation of a new committee.
He was laid to rest on Saturday afternoon.
ASP Saha hoped Rehan's relatives would file a case after the burial.