Published: Aug 13, 2010 2:51 PM EDT
Updated: Aug 13, 2010 12:51 PM EDT

BRADENTON, Fla. (AP) - A man and woman drowned in the Gulf of Mexico off the coast of Manatee County.

The sheriff's office reports that a married couple and their friend were swimming and rafting off northern Anna Maria Island Thursday afternoon when the wife and the friend began to struggle in strong currents. The couple's son called for help, and the son, the husband and other bystanders helped the two distressed swimmers out of the water.

The married couple, their son and the friend were all taken to a Bradenton hospital. The woman and friend went into cardiac arrest and died.

The names of the four victims weren't immediately released, but the sheriff's office says they were visiting from Tampa.