US police are searching for an armed man and have issued an alert for a two-year-old boy after two people were found dead in an apparent double murder in Rhode Island.

Toddler Isaiah Perez was discovered missing from a Johnston home at about 4:30 am.

Police say the Amber Alert is part of a double-homicide investigation but gave no details.

Authorities are searching for 22-year-old Malcolm Crowell, who they say snatched Isaiah from the home.

Police say he should be considered armed and dangerous.

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