Police arrested a former union parishad member from Askardighi area under Kotwali police station on Saturday noon in connection with the torture on a local Awami League leader.
The arrestee was identified as Indrajit Chowdhury Leo, a former UP member of the area.
Rashedul Islam, officer-in-charge of Patia Police Station, said a team of police raided one of Leo's relatives house and arrested him.
“Efforts are on to arrest the other people involved in the incident,” he said.
Earlier on April 29, Leo and his associates allegedly tortured Jiten Kanti Guho, vice-president of Haidgaon union unit Awami League, after tying up hands with a tree, in broad day light. His two hands were broken.
They tortured Jiten reportedly for not inviting the UP chairman in an Iftar party organized by Awami League.
The torture incident went viral on social networking site Facbook which drew a huge flack.
Tapash Kanti Guh, younger brother of Jiten filed a case mentioning the names of 7 persons and 5-6 persons as unnamed.
Police arrested the main accused in the case, Chairman Jasim and his son the day after the incident.