The Boston Police Department reports officers investigating two separate reports of gunfire arrested two men with loaded guns on Saturday - one of whom had his guns fall down his pants to the ground. A third man was arrested in another incident Saturday.

Police report that around 9 p.m., gang-unit officers responding to a call for shots fired in the area of Mount Ida Road happened upon a gray Nissan a witness had spotted leaving the scene, at Norton and Bowdoin streets.

Officers learned that the operator, Juan Muniz, 21, of Dorchester, did not possess a valid driver’s license and instructed him to exit the vehicle. When asked if he had anything illegal on his person, the suspect indicated that he was in possession of a firearm. The suspect was placed in custody without incident at which time the officers recovered a loaded .32 caliber Keltec P32 handgun from inside his pants pocket.

Muniz was charged with unlawful possession of a firearm, unlawful possession of ammunition and operating without a license, police say, adding they are still investigating whether he had any connection to the initial gunfire.

Around 11:45 p.m., police say, gang-unit officers responding to another report of gunfire, this time on Humphreys Street, were nearly rammed by a car whose driver had ignored a stop sign.

"The officers conducted a traffic stop and immediately observed that the passenger in the vehicle, later identified as Keiarri Dyette, 19, of Dorchester, appeared to be extremely nervous and was behaving in a suspicious manner. After numerous verbal commands to exit the vehicle to be frisked for officer safety, the suspect finally complied at which time the officers clearly observed a firearm sticking out of the waistband of his pants which then fell down his pant leg."

Police continue: "The 9mm Fabrique Nationale Herstal handgun was fully loaded with an extended magazine, a round in the chamber and the hammer cocked back."

Dyette was charged with unlawful possession of a firearum, unlawful possession of ammunition, carrying a loaded firearm and possession of a large-capacity feeding device, police say, adding they are still investigating whether he had any connection to the initial gunfire.

Police add officers made a third gun arrest on Saturday, around 2 p.m. at Erie Street and Michigan Avenue:

"The officers were in the area conducting an unrelated firearm investigation when they observed an individual, later identified as Dominick Gavin, 19, of Hyde Park, behaving in a suspicious manner. Upon noticing the officers in their unmarked police car and without any interaction or provocation whatsoever, the male took off running while clutching at the waistband area of his pants. Now believing that he may be armed, the officers exited their vehicle and pursued the suspect on foot through several backyards before finally placing him in custody at which time they recovered a loaded .32 caliber Davis Industries handgun from the suspect's jacket pocket."

Gavin was charged with unlawful possession of a firearm, unlawful possession of ammunition and trespassing, police say, adding he also had two outstanding warrants.