The Zirku crude oil tanker was seized some 250 nautical miles southeast of the Omani port of Salalah at around 0900 GMT, the EU Navfor anti-piracy mission said in a statement.
"The vessel was attacked by two pirate skiffs firing RPGs and small arms," the statement said.
In addition to the Pakistanis, the vessel was carrying three Egyptians, three Jordanians, two Ukrainians, one Indian, one Filipino, one Iraqi and one Croatian.
"There is no further information about the crew at present," EU Navfor said.
The ship was on its way to Singapore from Bashayer, Sudan, when it was attacked. (*)
Editor: Kunto Wibisono
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