A stabbing on Interstate 476 in Lower Merion Township, Pennsylvania, led to a police pursuit, the temporary lockdown of Villanova University and the arrest of a Philadelphia man, authorities said.
The incident unfolded Sunday, September 6, 2026, after a collision involving a U-Haul truck and a Mercedes on the ramp connecting Interstate 76 East with southbound I-476.
The confrontation that followed left the Mercedes driver with an abdominal stab wound and prompted a large police response as authorities searched for the people who fled the scene.
What Happened on I-476
According to the preliminary investigation, the incident began at approximately 5:30 p.m.
Police said the U-Haul struck the Mercedes from behind on the Blue Route. After the collision, several men associated with the U-Haul and possibly other vehicles confronted the Mercedes driver.
Investigators later alleged that Samuel Marquez, 40, of Philadelphia, attacked the driver and stabbed him in the abdomen with a box cutter.
The victim was found along the highway and taken to Lankenau Medical Center for treatment. Authorities described the injuries as serious, although the victim’s identity and later condition were not publicly released.
Later reporting indicated that the confrontation began after an argument involving driving behavior and an alleged brake-check. Police said Marquez was upset after the Mercedes driver attempted to get the U-Haul to back off.
Police Pursuit and Arrest
After the stabbing, the people involved left the area in multiple vehicles.
Lower Merion Township police and Pennsylvania State Police began searching for the suspects. The U-Haul was subsequently located at a Sunoco station on East Lancaster Avenue.
Police said Marquez fled from the vehicle on foot. He was later located and arrested in the surrounding area.
A second person described as a relative of Marquez was also taken into custody. Authorities continued to investigate the involvement of other individuals who were traveling with the U-Haul and other vehicles.
A Lower Merion police officer was also involved in a crash during the response. The officer was treated at a hospital and released.
Villanova University Lockdown
The search for the suspect led to a temporary lockdown at nearby Villanova University.
University officials issued a shelter-in-place and lockdown alert after authorities reported that an armed suspect was being sought in the area. The campus itself was not the location of the stabbing.
Villanova’s public safety department later confirmed that the suspect had been apprehended off campus and that the lockdown had been lifted.
The university said the precautionary measures were taken because of the proximity of the police search. Bus and shuttle services were temporarily suspended during the lockdown before resuming after the all-clear.
No continuing threat to the university community was reported after the suspect was taken into custody.
Samuel Marquez Charged
Police later identified Marquez as the primary suspect in the stabbing.
He was charged with aggravated assault and other offenses in connection with the incident. Court records listed his bail at $1 million.
Additional reporting stated that prosecutors allege Marquez intentionally rear-ended the Mercedes before the confrontation and used the box cutter during the subsequent attack.
The case remains subject to the criminal court process, and the allegations against Marquez have not been adjudicated.
Lower Merion Stabbing Details
| Detail | Information |
|---|---|
| Incident | Stabbing following a highway collision |
| Date | September 6, 2026 |
| Time | Approximately 5:30 p.m. |
| Location | I-476 near the I-76 East connection, Lower Merion Township, Pennsylvania |
| Victim | Mercedes driver; identity not publicly released |
| Injuries | Abdominal stab wound; reported as serious |
| Suspect | Samuel Marquez, 40 |
| Residence | Philadelphia, Pennsylvania |
| Suspected weapon | Box cutter |
| Vehicle involved | U-Haul truck and Mercedes |
| Arrest | Marquez taken into custody after fleeing the U-Haul |
| Charges | Aggravated assault and other offenses |
| Bail | $1 million |
| Villanova University | Temporary lockdown/shelter-in-place |
| Investigation | Pennsylvania State Police and local authorities |
Investigation Continues
Investigators are continuing to examine the events leading up to the collision and the confrontation that followed.
Authorities have also been reviewing the involvement of other people who were traveling with Marquez and the U-Haul. The investigation is expected to determine whether additional charges are appropriate.
The incident highlights how quickly a highway collision can escalate into a serious confrontation, with the subsequent police search extending into nearby communities and prompting precautionary measures at Villanova University.
For now, the criminal case against Marquez remains ongoing, while investigators continue working to establish the full sequence of events and the roles of everyone involved.
Disclaimer
This article is based on information available during the ongoing investigation. Criminal charges are allegations, and the defendant is presumed innocent unless proven guilty in court. Details concerning the victim, other potential suspects and the full circumstances of the incident may change as authorities release additional information.