According to a police source, a person believed to be the pilot was killed and three other people on board were injured.

The Beechcraft B200T plane went down at 5.18pm, the source said.

The body of the pilot and the injured were sent to the Seberang Jaya Hospital, it added.

Deputy Prime Minister Ahmad Zahid Hamidi expressed sadness over the incident.

In a post on his Twitter account, Zahid, who is also home minister, asked the family members of those involved in the incident to exercise patience.

“I am deeply saddened over the RMAF aircraft crash and the death of the pilot and those injured. Hopefully, the families will exercise patience,” he posted.

Chief of Defence Forces Gen Raja Mohamed Affandi Raja Mohamed Noor wants a comprehensive investigation into the crash.

Contacted by Bernama, he said the RMAF would set up a special team to probe the crash of the plane near the munitions terminal.

“I am on my way to the crash site. I have yet to get all the details,” he said.

Affandi expressed his sadness over the incident and hoped the families of those involved would exercise patience.

Defence Minister Hishamuddin Hussein, in a post on his Twitter account, said he had instructed the Chief of Air Force Gen Affendi Buang to personally monitor the investigation into the crash.

The identities of the dead and injured have yet to be made known.

In a statement, the RMAF said it was notifying the next of kin of the dead and injured.

It said the RMAF would set up a team to investigate the incident.

According to the RMAF official portal, the aircraft had been used for maritime surveillance by the 16 Squadron based at the Subang airbase.

The main task of the 16 Squadron is to provide early warning and immediately report the identification of vessels in territorial waters and the Exclusive Economic Zone (EEZ).

The squadron also monitors and reports on the activities at oil rigs and fishing zones, monitors and patrols occupied and claimed reefs, and monitors and reports on the infiltration of illegal immigrants and also activities that contribute to marine pollution.

The 16 Squadron has greatly assisted government agencies to reduce crime and smuggling in the EEZ.