- At least 23 died when the ferry caught fire Sunday morning local time
- Captain questioned over reports he abandoned ship
Divers are still searching for 17 people still missing from Sunday's fire.
"We have detained the captain of the boat, and are now taking his statement," Jakarta's maritime police director, Hero Hendrianto Bachtiar, told CNN Indonesia.
He said that three crew members and two port authority staff were in police custody.
At a press conference, Antonius Tonny Budiono, director general for sea transportation at the Indonesian ministry of transport, addressed reports that the captain was the first to leap off the Zahro Express ferry when it caught fire.
"A captain who abandons ship first is no captain at all," he said, according to CNN Indonesia. "A captain's obligation is to be the last person off the ship, after all the passengers have been evacuated."
He said that the captain would face severe sanctions, including the revocation of his sailing permit.