Kolkata, March 29 (IANS): Expressing serious concern over suspicion that a Bangladeshi gang was involved in the sensational ganrgape of a septuagenarian nun inside a convent at Ranaghat, West Bengal Governor Keshari Nath Tripathi on Saturday urged the central and state governments to act jointly to stop infiltration from across the border.

"This is a very serious problem," Tripathi told media persons on the sidelines of a programme here when his reaction was sought on the arrest of two Bangladeshis in connection with the March 14 incident.

"The central government and the state government must and should jointly take all the necessary measures to stop the infiltration of Bangladeshis in this state," he said.

Two days back the state police arrested a Bangladeshi national Mohammed Salim Sheikh, from a Mumbai slum for his alelged involvement in the crime.

Another person Gopal Sarkar was nabbed the same day from Habra in North 24 Parganas district for harbouring the gang of bandits, who brutalised the 71-year-old nun and looted the Convent of Jesus and Mary in Nadia district's Ranaghat, some 80 km from Kolkata.

Both of them are now being grilled in police custody.