Islamabad - The US Embassy Thursday said that United States strongly oppose any efforts to impose extra-constitutional change to the political system of Pakistan and believed that all parties should work together to resolve differences through peaceful dialogue to strengthen country’s democratic institutions and rule of law.“Violence and destruction of private property and government buildings are not acceptable means of resolving political differences”, the US Embassy said in a statement. It said it has been carefully monitoring the demonstrations in Islamabad. “We continue to urge all sides to refrain from violence, exercise restraint, and respect the rule of law”, the statement said.It further said that peaceful protest and freedom of expression are important aspects of democracy. However, the United States is in no way involved in the process or discussions between parties and any suggestion to the contrary is false and unhelpful to the dialogue between parties.Earlier, US State Department deputy spokesperson Marie Harf, said that Nawaz Sharif became prime minister through electoral process and US always supported democracy. She further said that America couldn’t demand the resignation with PM Nawaz Sharif.“Nawaz Sharif is the elected PM and we doesn’t support to the extra-constitutional change in Pakistan,” Harf said. “There is a Peaceful way to solve the problems and parties should find a solution to the problem soon,” she said. “The parties should avoid the violence way in Pakistan,” She added.Earlier the same day on Thursday, PTI Chairman Imran Khan had expressed disappointment and surprise at the US statement on Pakistan’s political crisis and his demand for resignation of Prime Minister Nawaz Sharif. The PTI chief said the US intrusion into Pakistan’s internal political matters was unacceptable. “Our protest is democratic and constitutional and it is unacceptable for an external power to intrude into the internal political dynamics of Pakistan, especially when it is going through a crisis,” he said.This news was published in The Nation newspaper. Read complete newspaper of 22-Aug-2014 here.