July 1, 2016 12:36 PM EDT

The families of some of the victims killed in the Charleston church shooting are suing the FBI, saying that mistakes allowed Dylann Roof to buy the gun used in the massacre.

Roof bought a .45-caliber handgun, which he used in the June 2015 shootings at Emanuel AME Church in Charleston to kill nine people. FBI Director James Comey has promised a full review, saying that Roof should not have been able to buy the gun, the Associated Press reported.

The mistake stems from a clerk entering incorrect information about Roof’s arrest on a felony drug charge, which prevented an FBI examiner from finding details about Roof’s arrest. Since he had previously admitted to felony drug possession, Roof should not have been allowed to buy the gun.

Roof faces murder and hate crimes charges, and he is currently in jail pending trials in both state and federal court. The Justice Department has said it will seek the death penalty

[Associated Press]

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