Rapid Action Battalion (RAB) and police in a joint drive arrested the prime suspect of the attack on Ghoraghatupazilanirbahi officer WahidaKhanam from Kaliganj in Hili area of Dinajpur district early Friday.
The arrestee was Asadul Haque (35) of Osmanpur in the Upazila.
Tipped off, a team of police from Hakimpur, Birampur and Ghoraghat police stations and RAB members conducted a joint drive in the area at about 4:50 am and arrested Asadul, said Wahid Ferdous, officer-in-charge of Hakimpur police station.
Later, he was taken to RAB office in Rangpur district.
Wahida Khanam, Upazila nirbahi officer of Ghoraghat, was seriously injured in an attack by a group of people at her home on the Upazila Parishad premises early Thursday.
Her father was also injured in the attack. They were taken to Rangpur Medical College and Hospital.
Later, the UNO was airlifted from Rangpur to Dhaka by a Bangladesh Air Force MI-171SH helicopter.
She was admitted to the National Institute of Neurosciences and Hospital, Dhaka.