The plane, with five crew members and eight passengers, dropped out of contact midmorning about 50 minutes after taking off from Bangka island off the southeast coast of Sumatra island, a police statement said.
National Search and Rescue Agency chief Henry Bambang Soelistyo said rescuers were searching seas between Mensanak and Sebangka islands.
He said villagers had found a seat and a bag containing a cellphone and police documents.
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