Port authorities found thousands of small steel balls hidden in water pots in a shipping container that consigned to the Tamils Rehabilitation Organisation, the army reported. Sri Lanka's Tamil Tiger rebels, who fought a two decade civil war against the government, are known for loading suicide bombs with metal balls to cause maximum damage. The rebels control a large area in the ethnic Tamil-majority north and have authorised the Tamils Rehabilitation Organisation to co-ordinate tsunami relief work there. The military website said the balls "could be used for production of bombs or explosives." The report said the pots, believed to have been shipped from Britain, are being held for investigation. A spokesman for the Tamils Rehabilitation Organisation said it would comment only after seeing the military's report.