COLOMBO (AFP) - Sri Lanka warned its citizens on Tuesday against visiting the south Indian state of Tamil Nadu a day after a group of Sri Lankan pilgrims were harassed and forced to take refuge in a church. “The government of Sri Lanka is constrained to request Sri Lankan nationals in the interest of their security to desist from undertaking visits to Tamil Nadu until further notice,” the external affairs ministry said. As well as the incident involving the pilgrims, the ministry highlighted how two Sri Lankan football teams visiting Tamil Nadu for friendly matches had been asked to leave. Sri Lankan military personnel undergoing training in the Tamil Nadu state had also been forced out, it said.