Authorities in Haiti have rescued two American children and a Haitian foster child who were kidnapped in Port-au-Prince late last week.

Police said the alleged kidnappers, dressed as policemen, snatched the children from their mother after she picked them up at school Friday. The children were rescued the next day during a police raid on an apartment in the Delmas area of the capital city.

Authorities said they arrested seven suspects, including a former police officer.

The children's parents, Christian missionaries from the U.S. state of Oklahoma, said while the children were missing they received a phone call asking for $350,000 in ransom.

The kidnappings were the latest in a string of such incidents.

Earlier this month, a U.S. grand jury indicted two Haitian men on charges of kidnapping a nine-year-old American girl in Port-au-Prince. She was rescued after a week in captivity.

Some information for this report provided by AP and AFP.