STATEN ISLAND, N.Y. -- It's the ultimate betrayal: A New York City firefighter making bogus 911 calls so he can steal cash from his Bravest brothers while they're out chasing wild geese reports.

Firefighter Joseph Keene stands accused of pulling the ruse at firehouses on Staten Island and in Queens and at the FDNY facility on Randall's Island.

Keene, 34, a resident of Hicksville, L.I., who's assigned to Engine Co. 75 in the Bronx, was arraigned Friday in Queens Criminal Court.

He is charged with two counts of burglary in the second degree; two counts of burglary in the third degree; one count of grand larceny in the fourth degree; falsely reporting an incident in the second degree; petty larceny and falsifying business records in the second degree.

The investigation is ongoing, according to the city Department of Investigation (DOI), which issued a report Friday regarding Keene's alleged crimes. The city agency is working in conjunction with the FDNY Bureau of Fire Investigation and the NYPD.

"It is surprising that a firefighter would both call in fake 911 calls and steal money from colleagues," said DOI Commissioner Rose Gill Hearn in a statement.

"To do so at this time, when there is a heightened need and demand for units to be responding to legitimate calls to people in need, is especially outrageous. This individual is not representative of the members of the New York City Fire Department who serve the city with such distinction."

Keene was interviewed this week by DOI and detectives at the NYPD Squad at DOI, during which time he reportedly admitted to the crimes.

According to the report, between May and July 2013 Keene made several false 911 phone calls that forced an FDNY response, allowing him to enter the affected firehouses and steal firefighters' money and other valuables.

On May 29, Keene allegedly made a 911 call reporting a smell of gas in the vicinity of Forest and Veltman avenues in Port Richmond. The call led nearby Ladder Co. 83/Engine Co. 163 to respond. During that time, Keene, who not assigned to the firehouse, allegedly entered and stole between $150 and $200.

Then, on or about June 2, Keene's alleged report of a transformer sparking at Forest Avenue and Victory Boulevard in Sunnyside rousted Ladder Co. 80/Engine Co. 157. While firefighters were out, Keene, not assigned to this firehouse either, allegedly entered the premises and stole between $400 and $500.

In both instances, the calls were determined to be unfounded. The investigation determined that the calls came from a cell phone near the firehouse; it was determined the calls came from a number registered to Keene's cell phone.

On June 11, 2013, Keene allegedly reported a gas odor at Jamaica Avenue and Little Neck Parkway, leading Engine Co. 251 in Queens to respond. Keene, who was not assigned to this firehouse, allegedly entered and stole approximately $1,200. In this instance, video surveillance showed a man who authorities identify as Keene entering and exiting in a vehicle that was registered in his name. The call was also determined to be unfounded.

On July 17, 2013, Keene reported for work at the FDNY facility at Randall's Island, where he allegedly stole between $40 and $60 from an employees' locker area.

Later that day, Keene entered Engine Co. 263/Ladder Co. 117 in Queens, while units responded to a Bronx fire. Keene gained entry unchallenged into the firehouse; no one asked him for identification and he was not required to sign into the Housewatch logbook. Once inside, Keene allegedly stole $100. A witness identified Keene as entering the firehouse that day.

The Island crimes are being referred to the district attorney's office. DOI is also referring the matter to the FDNY.

Keene has been a firefighter since March 2007; upon his arrest, he was suspended by the FDNY.

He is being held on $7,500 bail. He due back in court on Aug. 2.