The Detective Branch (DB) of police is interrogating Abdullahil Kafi, additional superintendent of police (Crime and Ops) for Dhaka district, on Tuesday.
The police officer was detained at Hazrat Shahjalal International Airport on Monday.
He stands accused of killing and burning students and people on August 5 in Ashulia.
According to DB sources, detectives received a tip-off about Kafi's escape. After a day filled with dramatic events, a team was able to detain him at Dhaka airport.
A video showing multiple bloody dead bodies piled on a van, with two individuals wearing police jackets throwing another body onto the pile, went viral on social media on Friday.
Upon investigation, it was found that the location in the video is near Ashulia police station in Baipail, Savar.
The dead bodies were burned later in a police van.
At least 31 people were reported dead during clashes in Savar on August 5.
Additionally, at least 15 more died from severe injuries while undergoing treatment.
Information has been confirmed on the deaths of at least 45 people on that day, with many others being treated for gunshot wounds in hospitals.
