Police arrested a 28-year-old man after he allegedly assaulted a police officer in Chinatown.

Shortly after 8:30 p.m. Thursday, police said the suspect became disorderly after a security guard caught him trespassing on private property. During the confrontation, the suspect harassed the guard and a tenant who resides at the property.

Police arrived and the 28-year-old man allegedly punched one of the officers in the face. When they detained the suspect, officers searched him and found a syringe and a bag containing heroin and methamphetamine.

Police arrested the 28-year-old man on suspicion of assault of a law enforcement officer in the first degree, two counts of promotion of a dangerous drug in the third degree, drug paraphernalia, criminal trespassing in the first degree and two counts of harassment.

The officer who was assaulted by the suspect was treated and released at a nearby hospital.