INDIANAPOLIS — Ghoulish gawkers are turning the scene of Mark Sanchez’s stabbing into one of Indianapolis’ hottest new tourist attractions.

Passersby have been stopping and taking pictures at the stretch of downtown sidewalk where Sanchez limped after being knifed around midnight Saturday.

The trail of blood was still spattered up the sidewalk and into the alley on Monday after the ex Jets quarterback allegedly bashed a grease truck driver.

“It sounds like he deserved it,” a woman said to her coworker as they walked by scene Tuesday. “He beat up a 69-year-old man.”

Another horror-loving Hoosier said the incident was the most exciting thing to hit Indianapolis in ages — so no wonder everybody was stopping by to have a look.

“Nothing interesting happens down here,” she said.

“It’s pretty f–king crazy,” a friend chimed in.

They were just a handful of the people The Post observed commenting on the attack near Loughmiller’s Pub and Eatery in the heart of the city — with more than a few following the blood into the alley and to take photos.

Timeline of the Mark Sanchez stabbing and arrest

Friday Night

• Mark Sanchez, 38, is in Indianapolis to serve as a Fox Sports analyst for the Raiders-Colts game on Sunday. He’s observed acting “erratically,” doing “wind sprints” in the alley behind Loughmiller’s Pub and Eatery in the downtown.

Just after midnight

• A grease truck driver picking up cooking oil from a nearby hotel parks his truck in the loading dock, blocking the alley where Sanchez is doing sprints.
• Sanchez approaches the driver to try to get him to move and eventually gets into an altercation where he body-slams him toward the wall and then to the ground.
• The driver sprayed Sanchez with mace or pepper spray, but the former NFL quarterback continues attacking him.
• The driver pulls a knife and stabs Sanchez two or three times in the chest, believing, “This guy is trying to kill me.”
• Sanchez turns around and heads up the alley.

12:30 a.m.

• Indianapolis Metropolitan Police Department officers respond to a report of a person shot. They locate Sanchez in Loughmiller’s Pub.
• It’s later reported that Sanchez is uncooperative with responding officers. He tells the detective he can only remember “grabbing for a window” and nothing else about the incident.
• Sanchez is rushed to the hospital in critical condition.
• The driver also suffered “significant injuries,” including lacerations to his cheek and jaw, with a cut that allegedly went through his cheek and hit his tongue.

Saturday

• Sanchez undergoes surgery for stab wounds to the chest, and is stable.
• He is arrested at the hospital and charged with misdemeanor counts of battery resulting in injury, public intoxication, and unlawful entry of a motor vehicle.

Sunday

• Sanchez is discharged from the hospital Sunday morning and transferred directly to central booking at Marion County Jail, where he reportedly posts his $300 cash bond.

Monday

• Sanchez’s charges are upgraded from several misdemeanors to a Level 5 felony battery of causing serious injury.

Sanchez, 38, was allegedly drunk and doing wind sprints in the alleyway by Loughmiller’s when he encountered Perry Tole on his route to pick up cooking oil from the kitchens at the nearby hotels.

The Fox Sports analyst allegedly became enraged that the truck was blocking the alley — and climbed into the truck when Tole said he couldn’t hear because he had taken out his hearing aids, according to cops.

After Sanchez body-slammed Tole, the elderly driver pulled out a knife and stabbed Sanchez, later telling police he was fearful for his life.

Tole suffered a severe laceration to his face when Sanchez allegedly stabbed him through the cheek with Tole’s own blade.

The ex NFL player staggered bleeding from the alleyway and down the street — where he was seen on video obtained by The Post clutching his bloody wound.

Both men are now in stable condition.

“I’m shocked that people still act like that,” said a worker from a neighboring Westin Hotel as they stood by the blood. “I’m just shocked that we can’t be cordial enough to let someone do their job.”

“I’m pretty sure the waste management guy was just trying to do his job and go home,” they added.

Sanchez has been arrested and charged with felony battery over the alleged attack. He told police he has little memory of the fight, according to an arrest affidavit.

Another passerby said the incident was sure to go down in history alongside one of the most notorious plays of Sanchez’s NFL career.

“The infamous butt fumble,” she said.