More countries must help Kenya to prosecute Somali pirates, a top United Nations official has said.
Jack Lang's comments came amid concerns that Kenya could be used as a dumping ground for the sea bandits who target ships for millions in ransoms.
Mr Lang, the UN secretary-general's special adviser on piracy law said Kenya's concerns were understandable and it may want to renegotiate its agreements to take pirate suspects.
The country currently has 136 pirates among its 53,000 prison inmates.
"Kenya is taking a big part of the burden," said Frenchman Mr Lang. "We can't ask just a few countries like Kenya to detain pirates for many years after conviction."
Kenya said last month that agreements with Britain, the US and EU to prosecute suspected pirates had lapsed. The East African nation also had agreements with Canada, China and Denmark.
However, Mr Lang stressed that Kenya had received a lot of support from donors. The country received a £2.5 million programme to upgrade its criminal justice system in return for the agreements, but some analysts believe Kenya is angling for more money.
Kenya took nine suspected pirates from an American warship on Tuesday and four from a Spanish warship last week.
Mr Lang said one possible solution might be for pirates to be returned to Somalia to serve jail sentences.
Somalia is a failed state that has not had a functioning government for 20 years, but the semi-autonomous regions of Puntland and Somaliland, which declared itself independent, have jailed pirates.