An elderly man was critically injured after an apparent ongoing neighborhood dispute in Delaware County turned violent Monday afternoon.

Police said a 74-year-old man was sent to the Hospital of the University of Pennsylvania in critical condition after an assault on Kent Street in Upper Darby.

Amir Sheikh, 23, was arrested and is expected to face charges of aggravated assault and related offenses.

The details of what led up to the assault are unclear, but police said the victim often fought with his younger neighbor over parking.

The suspect's brother, Salman Sheikh, said the elderly victim instigated Monday's violent altercation.

"He got in my brother's face, started spitting, started hitting him, so in retaliation to protect himself, my brother used self defense," he said.

But Victoria Mirzayan, the victim's sister, said it all began when the suspect called her derogatory names and pushed her to the ground.

Upper Darby Police Superintendent Michael Chitwood said when the victim came to his sister's aid, he was beaten to the point of losing consciousness.

"You got a 23-year-old and a 74-year-old, it's kind of unfair regardless of what the issue is," Police Superintendent Michael Chitwood said.

Sheikh was arraigned Tuesday morning. Authorities said the victim is back home after being released from the hospital.

The incident remains under investigation