Possible evidence in the case of a missing Washington state toddler has been sent to a forensic lab for analysis, police said Monday. 

Investigators found items over the weekend that they say could be related to the disappearance of 2-year-old Sky Metalwala, who disappeared more than two weeks ago. 

A tip from the public reportedly led police to the items, which were found on Saturday at Watershed Park in Kirkland, Wash., MyNorthwest.com reports. 

Police have not elaborated on what was found and said it is not yet known whether the items are related to the case. 

Julia Biryukova, the boy's mother, told police that her son disappeared Nov. 6 after she left him alone in an unlocked car to go for gas.

Biryukova said that she was driving her sick son to a hospital when she ran out of gas in Bellevue, Wash. She claimed she left the boy buckled into his car seat, sleeping, while she and her 4-year-old daughter walked to a Chevron gas station, about a mile away. When the two returned to the unlocked car, the child was gone, according to Biryukova.

But investigators have said the woman's story "doesn't add up," and is very similar to an episode of "Law & Order: SVU," which aired a day before the child disappeared.

They also said Biryukova's car had "a sufficient amount of gas" when it was examined by authorities. 

Biryukova and the child's father, Solomon Metalwala, are in the midst of a bitter divorce battle.

Metalwala told news outlets last week that he believes his son's disappearance is related to a court decision granting him visitation rights.

In divorce court documents, Metalwala said his wife suffers from mental illness and had dreams about killing the couple's children, according to Fox affiliate KCPQ.

Biryukova has accused Metalwala of domestic violence, claiming that he assaulted her in front of the children in December 2009.