Authorities search for missing 9-year-old Ala. twins Jordan and Taylor Dejerinett

(CBS/AP) HOPE HULL - Alabama authorities are searching for 9-year-old twins and a 73-year-old family friend who were last seen south of Montgomery.

The Department of Public Safety issued a missing child alert Monday for Jordan Alexander Dejerinett and his sister, Taylor Alexanera Dejerinett.

A flier from the agency says the children are considered to be in danger.

Officials say the twins were last seen on Sunday near Hope Hull with Jack Mac Girdner, who also can't be located. Girdner's white, 1988 Mercedes Benz is missing.

Lowndes County sheriff's investigator Chris West says Girdner has known the children's family for about three years. He says authorities believe the children might be with the man.

According to WSFA, the twins' mother, Terrye Moore, pleaded for trheir safe return.

"I just wanna know what happened. Wherever my children are, the family is pulling for you and we're here waiting for you to come back...safe return all in one piece and I love 'em," Moore reportedly said.

The station reports Moore says she doesn't believe Girdner would harm the kids. 

Lowndes County deputies are working on the case with the Alabama Bureau of Investigation.