UPDATED at 1:15 p.m. Thursday with additional information about suspect's background.
ST. LOUIS • One of two men shot Wednesday as police and agents from the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives, tried to arrest them has died.
Doctors at St. Louis University Hospital declared Myron Pollard, 18, dead at 2:06 a.m. today, authorities said.
The shooting occurred about 11:20 a.m. Wednesday at South Grand Boulevard and Iron Street.
Marino Vidoli, the special agent in charge for the Kansas City field office of the ATF, said the shooting came after an investigation over three weeks involving ATF agents and police. Authorities attempted to arrest some of those they were investigating Wednesday after receiving information that they planned to commit an armed robbery.
As they attempted to make the arrests, the suspects drove at ATF agents and tried to hit them, Vidoli said. One agent fired his weapon "to protect his life and the lives of others around him," Vidoli said.
In addition to the two people shot, three other people were arrested, Vidoli said. Authorities found three guns at the shooting scene.
Vidoli did not give more detail about the investigation and did not answer questions during a brief appearance to media this afternoon.
"ATF agents and St. Louis police officers did their job today," Vidoli said. "These are very dangerous individuals who intended to do serious harm."
According to court records, Pollard, of the 3600 block of Oregon Avenue, pleaded guilty to a felony charge of unlawful use of a weapon on July 30, and was sentenced to two years probation. Police had caught Pollard with a concealed .45-caliber semiautomatic handgun on Halloween night in the 3600 block of Minnesota.
Later on July 30, prosecutors charged him with misdemeanor marijuana possession after police said they caught him with several baggies containing what appeared to be pot on July 19 in the 3700 block of South Jefferson.
His mother, Hope White, posted $500 bond on that charge Monday.
In February, prosecutors filed assault and armed criminal actions against Pollard for allegedly shooting at a man walking with his brother and 2-year-old nephew in the 3600 block of Nebraska Avenue. The man was hit multiple times, charging documents say.
The grand jury failed to indict Pollard, however, said Circuit Attorney Jennifer Joyce.
At the time of his arrest on the 2011 charge, he told court staff that he was on probation in juvenile court for two drug possession charges.
A CRASH, THEN SHOTS
Dwayne Dorsey, 38, said he witnessed the shooting on Wednesday as he was dropping off his wife, an in-home health care provider, at an apartment building nearby. He said he pulled into the apartment building's parking lot with his wife and their 7-month-old daughter in the car and heard a crash.
When he looked up, he saw several people running from a car. Three law enforcement officers chased the people, and shots were fired, Dorsey said. He wasn't sure who was firing.
"It scared me to death when I heard the shots because I had my baby and my wife in the car," he said. "It was crazy."
Two of the fleeing men were shot on a parking lot near railroad tracks that run through the area, Dorsey said.
Matt Bodnar was applying a termite treatment to a nearby home when he also heard the crash and shots.
"It scared the crap out of me," said =Bodnar, 33, of Dittmer.
Michael Grime, 53, a former corrections officer who lives nearby, said he heard five distinct shots.
The area is just north of Carondelet Park, near a closed Foodland grocery.
In March 2011, about two miles to the north, a U.S. marshal was fatally shot near Marquette Park when a fugitive-search team went into a two-family flat at 3117 Osage Street. The marshal who died was John Perry. Perry was shot by Carlos Boles, who was killed in a shootout with police.
Kim Bell of the Post-Dispatch contributed to this report.