Mayor Rahm Emanuel’s 17-year-old son was robbed Friday night across the street from his family’s North Side home, leaving him with a chipped tooth and fat lip, a source told the Sun-Times’ Michael Sneed.

Zach Emanuel went outside to take a walk around 10 p.m. Friday and was jumped in the 4200 block of North Hermitage Avenue in Ravenswood, according to the source.

A mayoral spokeswoman confirmed Saturday that his son was hurt after he was attacked.

“Yesterday evening, Mayor Emanuel’s son Zach was assaulted in a robbery during which his phone was stolen,” Kelley Quinn said.  “He sustained injuries that required medical treatment but was able to join the family for a long planned trip. The mayor’s focus is on his son’s well-being.”

RELATED: Rahm taking family to Chile for vacation

Two people approached the teenager from behind as he was walking and talking on his cell phone, according to a police report that said one of them “placed his arm around the victim’s neck in a bear chokehold.” Then, the other attacker punched Zach Emanuel in the face, knocking him to the ground, the report said.

Accoridng to the police, the teenager dropped his phone, and his attackers took it, then patted him down and asked, “What else you got?”

Then, they forced him “to enter his security code to unlock the phone” and ran off.

Zach Emanuel was left with a chipped tooth and a fat lip, the source said.

According to the police report, he was treated by his “personal physician for a laceration and blunt-force trauma to the mouth/face.”

No weapon was involved, the source said.

The mayor, who attended the funeral Saturday of slain teen Demario Bailey, was “crestfallen” over his son being the victim of a strong-arm robbery, the source said.

-1Police on Mayor Rahm Emanuel’s security detail talk to a U.S. Postal Service employee  Saturday afternoon. Emanuel’s 17-year-old son, Zach, was injured in a robbery outside his North Side home late Friday night. | Craig M. Newman / Sun-Times

Earlier this week, the mayor spoke about his teenage son when asked about the trip the family was taking to Chile for the holidays.

“This is Zach’s last year before he goes off to college — if I don’t kill him before he goes there,” he said then. “But that’s a side note. That has nothing to do with the vacation. That just deals with having a teenaged boy at home.”

Contributing: Reema Amin, Sam Charles, Fran Spielman, Dan Mihalopoulos, Ashlee Rezin

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An unmarkerd Chicago Police car is parked  Saturday outside Rahm Emanuel’s Ravenswood home – where a detail is posted 24 hours a day. | Craig M. Newman / Sun-Times