HARVEY, LA (WDSU-CNN) — The Jefferson Parish Sheriff said the four suspects arrested in a quintuple-shooting have had run-ins with the law before Monday's case that left three children and two women hospitalized. 
Their rap sheets include various murder, armed robbery, assault, drug and weapon charges. Sheriff Newell Normand said the four men and the weapon used in the shooting at a Harvey apartment complex have been linked to a number of crimes in the parish.
"It's a small group of people that are having a significant impact out on the street," Normand said.
He said the four suspects, Davante Robertson, 19, Charlie Gumms, 18, Frankie Hookfin Jr., 21, and Lashawn Davis 20, are part of a larger group of people linked to a series of violent crimes. Those crimes include murders, attempted murders, aggravated assaults, aggravated battery and more, according to court documents.
Deputies said they have compiled an extensive list of names, dates and weapons connected to the crimes they've tracked since 2012.
"A lot of this is retaliatory stuff. A lot of it might be a drug rip. Some of it might be over a woman," Normand said.
Investigators said suspects arrested after Monday's ambush and shooting at the Lapalco Apartments are somehow related to other criminal investigations. Specifically, 21-year old Frankie Hookfin, Jr., has been on their radar in connection with a murder, deputies said.
"You've got players that are willing to do whatever is necessary to eliminate people that could be potential witnesses against them or otherwise when they're involved in an altercation," Normand said.
Three of the suspects in the shooting Monday -- Hookfin, Davis and Gumms -- have previously been arrested regarding killings in Jefferson Parish in 2010 and 2011.
David Wolfe with the Jefferson Parish District Attorney's Office said the men remained on the street because a lack of evidence in their cases kept them from being convicted.
Wolfe said the only evidence were statements from other people also arrested for those killings, which were not credible. Their cases were referred back to the sheriff's office to collect more evidence or witnesses.
Wolfe said investigations can be complicated when there are several defendants and not enough credible evidence, but they would be willing to re-evaluate a case if more evidence is found or witnesses come forward.