In a letter to President Mahinda Rajapaksa, Tamil National Alliance (TNA) leader R Sampanthan said, "You are aware that we and many others have consistently raised the issue of the heavily militarised atmosphere in the Northern Province, which is not at all conducive to the holding of a free and fair election"
The province's first ever council election is scheduled to be held on September 21.
"It is also a matter of record that at least three of our candidates were threatened by the army on the day we submitted our nominations," he said.
Sampanthan said it was clear that there cannot be a free and fair election if the military continues its interfering presence in the Northern Province.
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"It has thus become imperative for me to ask you to relegate the army and the other security forces to the barracks immediately and leave the maintenance of law and order in the hands of the Police.
The 714,000-strong mainly Tamil electorate will exercise their franchise in the poll that is being held after the army defeated Tamil Tiger rebels in 2009.
In the nearly three-decade long ethnic war up to 40,000 civilians were killed, according to the UN.