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(NBC NEWS) -- New York City cops arrested a man dressed as Cookie Monster in Times Square for allegedly pushing a 2-year-old boy after becoming angry the child's mother didn't give him a tip on Sunday, law enforcement sources say.

The mother told police the costumed Sesame Street character became aggressive after she snapped a photo of him with her son. She said he demanded $2 and started pushing her boy.

The man in the Cookie Monster suit then began to verbally assault the woman, she told police, cursing at her and calling her son offensive names.

He then allegedly pushed the child, the sources said. The boy was not injured.

The man in the suit, 33-year-old Osvaldo Quiroz-Lopez, was arrested and charged with endangering the welfare of a child, law enforcement sources said.

Information on an attorney wasn't immediately available.