A mentally ill man’s mother, who claims cops fatally shot her son after she called 911 seeking medical help for him, held a rally outside US Attorney Preet Bharara’s Manhattan office Thursday to push for charges against the officers.

“Today I am here to call on Preet Bharara [and] ask him to do a full investigation for my son’s case,” a tearful Hawa Bah said.

“My son, Mohamed Bah, never committed a crime in his life. He was an honors college student.”

Mohamed Bah was shot in his Harlem apartment in 2012 after his mom called 911 because he was acting strangely.

The cops have said they shot Bah because he lunged at them with a knife. They were cleared of any wrongdoing by a Manhattan grand jury in 2013.

But Bah’s family has continued to press for federal charges, saying there is evidence the cops broke with NYPD protocol when they cracked open the mentally ill man’s door.

Bharara’s office declined to comment on the status of the probe, which they discussed with Bah’s lawyers in July.