The United States military in Afghanistan yesterday urged warring parties to return to the political path in a rare open letter to the Taliban as a surge in violence risks shattering a hoped-for peace process.<br />'' <br />'' In a  letter to the Taliban, US Forces-Afghanistan Spokesman Colonel Sonny Leggett said, all sides must show restraint to prevent further bloodshed. If the violence cannot be reduced, then there will be responses, Leggett wrote in a letter to Taliban Spokesman Zabihullah Mujahid.<br />'' <br />'' Under the terms of a US-Taliban deal signed on 29 th of February, the Taliban committed to stop striking US and foreign partner troops and agreed to start peace talks with the Kabul Administration following an exchange of prisoners. In return, the US and other foreign troops will leave Afghanistan within 14 months of the deal signing.<br />'' <br />'' While the Taliban have refrained from hitting coalition forces and cities, they returned to the battlefield the moment the deal was signed and have been unleashing an average of 55 attacks a day on Afghan forces, according to Afghan officials.<br />''  <br />