(Reuters) — Somali pirates have freed two hijacked vessels, the African Sanderling, a Korean-owned bulk carrier, had been seized with its 21 Filipino crew on October 15.

The Karagol, a Turkish chemical tanker with 14 Turkish crew, had been carrying 4,000 tonnes of chemicals to Mumbai when it was seized on Nov. 12.

Below are some of the ships believed to be still held:

Faina Seized September 24. The ship was carrying 33 T-72 tanks, grenade launchers and ammunition destined for Kenya's Mombasa port. Pirates have demanded $20 million in ransom.

Stolt Strength Seized November 10. The chemical tanker had 23 Filipino crew aboard. It was carrying 23,818 tonnes of oil products.

Tianyu 8 Seized Nov. 13/14. The Chinese fishing boat was reported seized off Kenya. The crew included 15 Chinese, one Taiwanese, one Japanese, three Filipinos and four Vietnamese.

Chemstar Venus Seized Nov. 15. The tanker was travelling from Dumai, Indonesia, to Ukraine. It had 18 Filipino and five South Korean crew.

Biscaglia Seized on Nov. 28. The Biscaglia, a Liberian-flagged chemical tanker, had 30 crew on board: 25 Indians, three Britons and two Bangladeshis.

NAMES UNKNOWN:

On December 10, pirates hijacked two Yemeni fishing vessels with a total of 22 crew in coastal waters in the Gulf of Aden. Five crew reportedly escaped.

On December 16, a yacht with two on board, an Indonesian tugboat used by French oil company Total and a 330 foot cargo ship belonging to an Istanbul-based shipping company were hijacked. Pirates also hijacked the Chinese fishing vessel Zhenhua-4 with 30 Chinese crew aboard but it was freed the next day.

Blue Star seized on New Year's Day. The Egyptian merchant ship was sailing east with a cargo of 6,000 tonnes of urea, a product used as a fertiliser. It had 28 Egyptian crew aboard.

Sources: Reuters/International Maritime Bureau Piracy Reporting Centre/Lloyds List/Inquirer.net