Pirates attacked another U.S. cargo ship off the coast of Somalia, Wednesday, delaying the return of the American captain freed last week from pirates in the area.

The Liberty Sun was headed to Kenya with food and supplies when pirates fired automatic weapons and rocket-propelled grenades.

The ship was able to get away from the pirates and none of the 20 crew members were hurt.

Still, the ship is being escorted by the USS Bainbridge-- the same warship that came to the rescue of Capt. Richard Phillips when his ship, the Maersk Alabama, was attacked last week.

Phillips was freed Sunday when Navy snipers killed three of the pirates holding him hostage.

He was supposed to reunite with his crew in Kenya so they could fly back home together but because his rescue ship had to be diverted, the crew had to take off without him.

They will arrive at Andrews Air Force Base in Maryland Wednesday night.

A second plane will be waiting for Phillips once he arrives in Kenya.

He will then be reunited with his crew and family on U.S. soil.