<p>The letter was received yesterday by the office of the Haridwar Railway Superintendent, which had also got several such letters in the past.<br /><br />A spokesman of Haridwar Police said efforts were on to trace one Karim Ansari, who is said to have written the letter.<br /><br />The terrorist outfit had earlier threatened to attack vital installations on the occasion of Independence Day.</p>
<p>The letter was received yesterday by the office of the Haridwar Railway Superintendent, which had also got several such letters in the past.<br /><br />A spokesman of Haridwar Police said efforts were on to trace one Karim Ansari, who is said to have written the letter.<br /><br />The terrorist outfit had earlier threatened to attack vital installations on the occasion of Independence Day.</p>