Rapper Christopher “Notorious B.I.G.” Wallace was shot and killed with a very rare form of ammunition, according to new documents released by the FBI under the Freedom of Information act.

While most of the information is known, the FBI documents reveal details into what the agency knew about the case.

The FBI investigation also stated that a variety Los Angeles Police Department officers, both on and off duty – with gang ties – helped the shooter escape, in addition to stymying the investigation, by not following up on witness reports, or properly documenting witness statements.

At one point, at least 10 witnesses were ready to provide information, but refused to talk to the LAPD.

They were willing, however, to talk to the FBI about the murder. The FBI also has uncut video of the shooting

The documents states that while Death Row was making millions selling records by artists like Tupac, Snoop Dogg and Tha Dogg Pound, other associates working for the label were allegedly selling kilos of cocaine for $14,000, which were then re-sold on the East Coast, for $24,000.

According to the documents, B.I.G. was shot and killed with rounds of Gecko 9mm armor piercing ammunition, which is rarely found in the United States and made in Germany.

After an anonymous caller tipped other police that an unnamed Mob Piru Bloods gang member was involved, Los Angeles Police Department officers obtained a search warrant and found 9mm guns and more Gecko 9mm rounds.

The LAPD never conducted ballistic tests and according to documents, more officers were involved in thwarting the investigation, including two of former Chief Parks’ “personal recruits.

Check out the documents here.