Kenyan authorities have arrested three men with alleged links to Osama bin Laden's al-Qaeda on suspicion of plotting terrorist attacks in the East African nation, a police official said on Monday. The trio -- a Sudanese national and two Kenyans -- were detained on Saturday in northeast Kenya near the border with lawless Somalia and transferred to Nairobi for questioning by anti-terrorism police, the official said. "We are holding one Sudanese and two Kenyans on suspicion of involvement in terrorism activities," the official said, suggesting that Kenya may have been tipped to the threesome's alleged activity by foreign intelligence. "We got a hint from sources I cannot disclose now of their involvement in terrorism activities and links to bin Laden," the official said on condition of anonymity. "The investigation is continuing."Police took them into custody as they were travelling along a normally unpatrolled road in Kenya's northeastern Tana River district, the official said. "The route ... is not manned by police and that's why it appears they were using it," the official said. Kenyan authorities believe that the route has been used by terrorists in the past, notably to transport bombs and other weapons from Somalia to Kenya for the deadly 2002 attacks on Israeli interests in the port town of Mombasa.