Police need your help finding man they say tried to sexually assault a woman in Central Park earlier this week.

It happened Thursday afternoon near 106th Street and West Drive.

Police say the man in this sketch grabbed a 26-year-old woman by the neck, threw her to the ground and demanded money.

She told him she did not have any, so he took her cell phone.

The alleged attacker then pulled down his pants and tried forcing the victim to perform a sex act.

Two passersby heard the woman screaming and came to help.

The man — described as 20 to 25 years old and about 5 feet 8 inches tall — ran off.

Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-TIPS, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.