Oklahoma City Duo Lands in Federal Prison for More Than Nine Years Collectively after Pipe Bomb and Ammunition are Found During Traffic Stops

OKLAHOMA CITY – CALEB GRAVES, 33, of Del City, and ROBERT ALLEN KEEFE, 25, of Oklahoma City, have been sentenced to serve 109 months collectively in federal prison for illegal possession of ammunition and possession of an unregistered destructive device, announced U.S. Attorney Robert J. Troester.

On November 6, 2024, Graves was charged with being a convicted felon in possession of ammunition. On April 1, 2025, he was also charged with possession of an unregistered destructive device and felon in possession of a firearm, namely, an improvised explosive bomb. On April 1, 2025, Keefe was charged with possession of an unregistered destructive device related to the same improvised explosive bomb.  Firearms and pipe bombs are considered destructive devices under federal law.

According to public records, on August 18, 2024, officers with the Village Police Department stopped a vehicle driven by Graves and observed a loaded firearm magazine. The following day, agents with the Bureau of Alcohol, Tobacco, Firearms and Explosives executed a search warrant at Graves’ residence, where they several rounds of ammunition in his vehicle. While on pretrial release awaiting trial, Graves was arrested again, this time on October 14, 2024, after Oklahoma City Police Department officers stopped Graves in his vehicle and located a hidden pipe bomb.  Keefe, who was the lone other passenger, was arrested, as well.

On June 6, 2025, Graves, who had previously been convicted of a felony, pled guilty to being a felon in possession of ammunition and a felon in possession of a firearm, namely an improvised explosive bomb. Federal law prohibits previously convicted felons from possessing ammunition and firearms, including bombs. On June 9, 2025, Keefe pled guilty to being in possession of an unregistered destructive device.

Public records further reflect that Graves has previous felony convictions in Oklahoma County District Court for:

• Second degree burglary, possession of stolen property, and conspiracy to commit a felony in case number CF-2010-4613;
• possession of a methamphetamine in case number CF-2016-3849; and
• child neglect and possession of contraband in a penal institution in case number CF-2016-4096.

At sentencing hearings this month, U.S. District Judge David L. Russell sentenced Graves to serve 72 months in federal prison, and sentenced Keefe to serve 37 months in federal prison, followed by three years of supervised release for both. In announcing the sentences, Judge Russell noted the seriousness of the offense and the need to provide just punishment.

This case is the result of an investigation by the Bureau of Alcohol, Tobacco, Firearms and Explosives, the Village Police Department, and the Oklahoma City Police Department. Assistant U.S. Attorney Drew E. Davis prosecuted the case.

Reference is made to public filings for additional information.