The Eastern Sabah Security Command (Esscom) enforcement team also brought in 11 boats boarded by those detained off the waters of Sandakan, Semporna and Lahad Datu.
Esscom Commander Datuk Abdul Rashid Harun said seven of the boats were stopped by the Malaysian Maritime Enforcement Agency while the rest were caught by the marine police team.
"We stopped them for being in the curfew area which starts from 6pm to 6am," he said in a statement, Monday, adding that a majority of them failed to produce valid documents.
Abdul Rashid reminded civilians to abide by the curfew, which was enforced to curb international border crime, particularly kidnapping and smuggling in the Esszone.
On Saturday, Sabah Police Commissioner Datuk Jalaluddin Abdul Rahman declared the curfew on the East Coast of Sabah three nautical miles from the coast of Tg Pundaras in Sandakan, Kinabatangan, Lahad Datu, Semporna and Jeti Tawau in Tawau from July 19 until Aug 2.
He said trespassers could be punished with a RM500 fine or six months' imprisonment.
Jalaluddin said the security forces could also shoot on sight at any intruders they knew to be involved in kidnapping or murder cases, which carries the death penalty or a life sentence.