KOLKATA, India (AFP) - Indian border guards have arrested 150 Bangladeshis who sailed into India in what security officials Saturday called the biggest interception of illegal migrants in decades. The arrests were made Friday when the immigrants, who included 36 women and 40 children, sailed into India in two speed boats through the Ichamati and Raimongal rivers that flow through the South Asian countries. "After 1971, this is first time so many Bangladeshi nationals were arrested while crossing the border," India's Border Security Force inspector general C.V Muralidharan said. The Bangladesh deputy High Commission in eastern Kolkata city said it unaware of the reported incident. India is home to tens of thousands of Bangladeshis whom officials say crossed illegally into the country, mainly through borders in West Bengal, Tripura and Assam. The two countries share a 4,000-kilometre (2,500-mile) border, part of which has been fenced by India in a bid to halt to prevent illegal immigrants sneaking into its northeastern states.