FBI agents carry out investigations on board the U.S flagged Maersk Alabama.
They've labelled the vessel a crime scene after it was briefly hijacked by Somali pirates on Wednesday.
Crew members managed to regain control of the vessel carrying thousands of tonnes of food aid for Africa.
The ship is now safely docked at Kenya's Mombassa port.
Security around the freighter is tight.
One of the port officials said investigations could take more than a week.
SOUNDBITE: JOURNALIST ASKING:
"Can you tell us how many days the investigation to take?"
(UPSOUND) (English) KENYA PORTS AUTHORITY OFFICIAL, SAYING:
"Maybe 5-10 days or something of the sort."
The Maersk Alabama's captain, 53 year old Richard Phillips, remains at sea.
He was taken hostage by the pirates and is being held in one of the ship's lifeboats.
Somali mediators are attempting to secure the American captain's safe release.
Some 270 hostages are being held by pirates preying on ships in the Gulf of Aden and the Indian Ocean.
Basmah Fahim, Reuters.
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