Peel Regional Police are looking for a young boy described as a vulnerable child who may be non-verbal after he was reported missing at a Mississauga park.Three-year-old Zaid was last seen at 6:20 p.m. on Thursday in Erindale Park, near Mississauga Road and Dundas Street West.He is described as having a thin build and a short, dark afro haircut. When he went missing, he was wearing a yellow top with red writing and black pants without shoes or socks.Firefighters joined Peel Regional Police in the search late Thursday night, and a photo posted on social media showed crews searching the Credit River, which runs through the park.CityNews saw a police helicopter and a drone repeatedly fly over Erindale Park early Friday while Peel police officers blocked the entrance to the darkened ravine and park.Several members of the public could be seen arriving at the scene offering to help with the search as some used their cellphone lights to search bushes outside of the park entrance.