New Hampshire State Police have issued an Amber Alert Friday in the search for two young children believed to have been abducted by their mother. 

Alaina and Chance Wilson, ages 11 and 8, respectively, were reported missing from their grandmother’s home Thursday night and "appeared to have been removed from the residence through a window," police say. 

"They were last seen at [the] residence at approximately 7:30 p.m., located at 93 Colonial Village Park in Somersworth, NH, where they live with their grandmother (who has custody of them)," New Hampshire State Police said. 

Investigators say Alaina’s phone was left on her bed, and the children are believed to have been "abducted by their biological mother," identified as 32-year-old Kaileigh Nichols. 

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Alaina Chance Wilson Amber Alert New Hampshire

Alaina Wilson, 11, and Chance Wilson, 8, are believed to have been abducted by their mother, New Hampshire State Police say. (New Hampshire State Police )

State Police allege Nichols stole a gray 2009 Honda Civic from a relative in Maine and was seen in that car at a school event in Somersworth earlier Thursday. 

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According to a police statement, Nichols also suffers from drug addiction and mental health issues. 

Kaileigh Nichols New Hampshire State Police

Kaileigh Nichols is described by investigators as Alaina and Chance's biological mother. (New Hampshire State Police)

The mother is described as being around 5 feet tall with brown hair and brown eyes, weighing 125 pounds. 

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Alaina is said to be around the same height with the same features, weighing 96 pounds. Chance, who is around 4 feet 8 inches tall, weighs 68 pounds, according to police.

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New Hampshire State Police Amber Alert car

The grey 2009 Honda Civic being sought by New Hampshire State Police in connection to the disappearance. (New Hampshire State Police)

The plate on the vehicle being sought in connection to their disappearance is a Maine veterans one with a registration 2827A.