Police returned to the scene of the crime Monday to examine bullet holes in two residences after new information was provided to police by an alleged third victim of the shooting.
Harrison's representatives say Harrison was not present during the shooting incident, and that his gun was not involved. Monday, Harrison's attorney declined comment. Police say they have no suspects in the case.
The case is being taken over by Philadelphia District Attorney Lynne Abraham.
The Indianapolis Colts star receiver was interviewed by police about last week's shooting, but Harrison was neither arrested nor charged.
ESPN Radio
Appearing on Mike and Mike in the Morning, Sal Paolantonio updated the Marvin Harrison case. Things could materialize within a couple of days, but Sal wonders: Why is Harrison going back to a terrible neighborhood and patting people down when they go into his sports bar? Listen
"He was interviewed," Lt. Frank Vanore said Friday. "Why he was interviewed, that is all part of the investigation. No one is a suspect."
Harrison's agent, Tom Condon, told ESPN's Chris Mortensen on Friday: "I've spoken with Marvin and I've spoken with his attorney, and they say the reports are erroneous. Marvin was not involved in any shooting, and he is not the subject of this investigation."
Condon declined to answer any other questions.
A source told the Philadelphia Daily News that Harrison, during an interview with police, later admitted to being in a fistfight on April 29, but the Colts receiver said he wasn't involved in the shooting.
NFL gun policy
While police investigate whether Marvin Harrison was involved in a Philadelphia-area shooting, the NFL's policy on guns is clear: "Be careful and understand the risks."
The league policy says a player may not possess a gun or other weapon while performing any service for his team or the NFL. In Harrison's case, he was not involved in any NFL-related function. He owns a bar and a car wash.
The policy advises: "If you legally possess a weapon, you must understand the local, state and federal laws that apply."
Weapons laws are different in each state, and this is where Harrison -- even if he's not involved in the shooting -- could face problems. In Pennsylvania, the owner of a weapon involved in a shooting can be charged in the crime. If police legally determine the handgun belongs to Harrison, he could be charged with at least a misdemeanor.
If that is the case, Harrison could face NFL discipline, which could result in a suspension. According to the policy: "If you violate a public law covering weapons -- for example, possession of an unlicensed firearm -- you are not only subject to discipline, including suspension from playing, but also subject to criminal prosecution."
-- John Clayton
• Read the NFL gun policy
A source told 610 WIP radio in Philadelphia that the victim came into Playmakers -- a bar owned by Harrison that is about a half-mile from his car wash -- about 5 p.m. and engaged in an argument with Harrison. The victim then left the bar, heading to his car, with Harrison following. Gunfire broke out and the victim was hit in the hand.
A source told the Philadelphia Daily News that a 2-year-old boy suffered a cut under his eye from glass that shattered when an errant bullet hit a car windshield, according to police.
Police came to the scene, but the victim did not identify a shooter.
On Wednesday of last week, according to the WIP report, a source said ballistic tests showed that the gun that had fired the shots was a custom-made Belgian weapon, and police determined that Harrison owned such a gun. A source told ESPN.com's John Clayton that the gun is registered.
Police then went to the Philadelphia car wash owned by Harrison to question him about the gun. Harrison admitted owning such a weapon but claimed it never left his suburban Philadelphia home.
However, WIP's source said the gun was discovered in a bucket at the car wash, and tests showed that it had fired seven bullets that matched those found at the scene.
Harrison, a prep football star at Philadelphia's Roman Catholic High, has owned Playmakers since July 2004, according to state records.
Harrison has played his entire 12-season career with the Colts and is the franchise's record holder in every major receiving category: receptions (1,042), yards (13,944), touchdowns (123) and 100-yard games (59). The 35-year-old is one of only four players in league history to top 1,000 receptions.
But after eight consecutive Pro Bowl appearances, last season was the most frustrating of Harrison's career.
He injured his left knee against Denver on Sept. 30, missed all but five games and finished with 20 receptions for 247 yards and one TD.
Off the field, Harrison was sued after the 2005 Pro Bowl when three boys accused him of attacking them when they tried to get his autograph. The suit alleged Harrison "violently and physically attacked" the minors, including placing a "potentially deadly choke hold" on one of the boys, but it was later dismissed.
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