A two-year old boy is missing after his mother left him unattended in an unlocked car on Sunday morning.

Sky Metalwala's mother told Bellevue, Wash., police she ran out of gas, and left her son strapped into a car seat while she and her four-year-old daughter walked to a Chevron station a mile away. He was reportedly unattended for an hour.

The police have not yet issued an Amber Alert, which, along with information published in a Seattle Times article, could indicate that police are unconvinced that Sky was kidnapped.

According to The Seattle Times, police conducted a search of the area where Sky went missing Sunday afternoon but called off the search at around 6 p.m.  There were no plans to resume the search on Monday.

King County felt like they had done a very thorough search of a pretty wide area for the boy and were confident that he wasn't there, Officer Carla Iafrate, spokesperson for the Bellevue Police Department, told the Times.

Lafrate also said the police did not find a portable gas can in or near the car.

We don't know much, other than that the child is still missing, Iafrate told the Times. I don't know if the child got out on his own. We don't have very much information.

At this point we're just treating it as a missing child, Iafrate added. We don't know anything more yet.

The Times reported Monday that the FBI had joined the search, but did not specify in what capacity.

According to King County District Court records obtained by the Times, Matalwala's parents were charged in Dec. 2009 with reckless endangerment and leaving a child unattended in a motor vehicle.

lafrate reportedly told a Fox News affliliate the boy's parents were cooperating with the investigation.

Sky Metalwala is of Indian and Caucasian descent, with dark buzz-cut hair and brown eyes. The toddler was last seen wearing a dark green hooded sweatshirt and blue and gray striped pants.

Anyone with information on his whereabouts is urged to immediately call 911.