Jahlil Okafor: Attacked Before Gun Incident ... Cops Say

A seemingly drunk Jahlil Okafor was knocked to the ground before he had a gun pulled on him during an altercation in Philly back in October ... this according to an incident report obtained by TMZ Sports.

The two National Park Service officers involved in the incident have finally given official statements describing exactly what they saw the night Okafor had a gun pulled on him.

According to documents, two officers noticed Okafor -- who appeared intoxicated -- stumbling down the street in an area famous for nightlife while two friends held him up around 2:20 AM on October 4th.

The officers say the guys began to yell at each other -- and at one point, Okafor broke away from the group and started to bang on the back of a black Chevy Camaro.

Cops say they witnessed the driver of the car get out and strike Okafor -- causing him to fall in the street.

A witness had previously told CSNPhilly that Okafor punched the driver of the car through an open driver's side window -- but the officers made no mention of that in their report.

After Okarfor was knocked to the ground, cops say a 2nd man approached the NBA star and pointed a gun at him.

One officer says he drew his own weapon and shouted, "Police ... get on the ground, drop the gun."

The suspect ran away -- and reportedly ditched the gun, which was recovered the next day by Philly PD.