The arrestee was identified as Shahidul Islam Swadhin, a member of Sarmangal union parishad in Dirai upazila of Sunamganj district.
The PBI team arrested Swadhin from Gurabhui area of Kulaura upazila around 3:30 am, said Superintendent of PBI Police Mohammad Khaled Uz Zaman.
On Wednesday, Hefajat-e-Islam followers vandalised several Hindu houses in Sunamganj as a Hindu youth had "criticised the party's Joint Secretary General Maulana Mamunul Haque on social media."
Also read: Hefajat supporters' attack on Hindu houses: 700 people sued
A young man from Hindu community, Jhumon from Noagaon village made a Facebook post on Tuesday night. As the post went viral, police detained him with the help of locals on the same night.
Shalla Police Station Officer-in-Charge Nazmul Huq said several houses in the upazila's Noagaon village were attacked.
Two separate cases were filed against 700 people on Thursday over the attack on Hindu houses, said Shalla Police Station Officer-in-Charge Md Nazmul Haque.
One case was filed by a victim and another one by the law enforcers, he said.
END/UNB/Corr/MAS/FH