Suffolk police made two separate arrests Sunday involving parents accused of leaving their children unattended in cars while shopping.

Marcela Monaco, 39, of Bayville was arrested on one count of endangering the welfare of a child after police found her 4-year-old son and a dog unattended in a gray Toyota Yaris in the parking lot of a Huntington store.

advertisement | advertise on newsday

Second Precinct Police Officer Peter O'Brien found the boy about 3 p.m. locked in the unheated car. Witnesses said the boy and dog had been in the car 20 minutes before police arrived.

In the second case, Donald Hayes, 33, and Sarah Hayes, 34, both of Patchogue, were arrested on two charges of endangering the welfare of a child after police responded to a call that three children were crying in an unattended car at the Gateway Plaza parking lot along Sunrise Highway in Patchogue.

About 6:20 p.m., Fifth Precinct Police Officer Marc Sforza arrived at the parking lot and found a 6-month-old boy, 5-year-old girl and 8-year-old boy in the unlocked 2012 Hyundai Accent. Police said the children had been in the car for about an hour before their parents returned from shopping at a Marshall's in the shopping center.

All three parents are scheduled to be arraigned at First District Court in Central Islip Monday, and Suffolk County's Child Protective Services Bureau will be notified, police said.