Nazmul Huda, who is the Savar correspondent for News 24, Ekushey TV and Daily Bangladesh Pratidin, was arrested from Savar's Baipail area on Friday night.
Police filed a case against him under the ICT Act at Ashulia police station.
Nazmul's personal vehicle, his laptop, camera and mobile phone were seized. The Detective Branch has taken him in custody for interrogation under instructions from higher authorities.
Ashulia circle's Assistant Superintendent of Police Nazmul Hasan Firoz confirmed the arrest and said the journalist was being accused of publishing false reports and disseminating false information through fake IDs on Facebook.
He said Nazmul was involved with local BNP leader Aman Sarker, who is charged in several sabotage cases and Jhut trader Selim Nayan. These two men took Nazmul to Malaysia on December 13 and returned on December 18.
From there Nazmul spoke on the phone with a workers' leader named Shamim, who is also under arrest, the ASP said. Police were looking into these phone calls, he added.
Meanwhile, on the 12th day of garment worker unrest, 59 factories remained closed. Additional police, BGB and other law enforcement agencies maintained a heavy presence in the industrial belt, especially around the factories.
The area remained quiet, with police making frequent announcements on loud speaker warning workers not to come to the factories or the main streets.