A police constable, 22, was among four members of a robbery gang detained in a crackdown in Temerloh, Pahang.
Also seized in the raid were a cache of firearms, drugs and other items such as a handmade air gun, five toy pistols, two pairs of handcuffs, eight samurai swords and a baton.
Police also recovered 17 psychotropic pills, four laptops, seven branded watches and 19 cell phones, reported Malaysia's The Star.
Assistant Police Commissioner Abdul Aziz Salleh of Temerloh said the gang was believed to be responsible for a spate of armed robberies and break-ins.
Mr Abdul Aziz said the district's narcotics and CID officers mounted a joint operation after receiving information on the gang's activities.
"We ambushed a house in Taman Bahagia Indah here at about 8.50pm on Thursday.
"The occupants refused to cooperate and we had to break into the house through the back entrance," he said. He added that the four suspects, aged between 21 and 27, including a woman, were arrested in a room.
"We also seized a cache of weapons and other items in the living room of the rented double-storey house," he said.
Mr Abdul Aziz said background checks showed the suspects had no previous criminal records.
He said that besides committing crimes, the gang was also believed to include members of a secret society and drug pushers.
Investigations are ongoing.
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