A series of sit-in street protests, often called the Umbrella Revolution and sometimes used interchangeably with Umbrella Movement, or Occupy Movement, occurred in Hong Kong from 26 September to 15 December 2014. The protests began after the Standing Committee of the National People's Congress (NPCSC) issued a decision regarding proposed reforms to the Hong Kong electoral system. The decision was widely seen to be highly restrictive, and tantamount to the Chinese Communist Party (CCP)'s pre-screening of the candidates for the Chief Executive of Hong Kong. Students led a strike against the NPCSC's decision beginning on 22 September 2014, and the Hong Kong Federation of Students and Scholarism started protesting outside the government headquarters on 26 September 2014. On 28 September, events developed rapidly. The Occupy Central with Love and Peace movement announced the beginning of their civil disobedience campaign. Students and other members of the public demonstrated outside government headquarters, and some began to occupy several major city intersections. Protesters blocked both east–west arterial routes in northern Hong Kong Island near Admiralty. Police tactics – including the use of tear gas – and triad attacks on protesters led more citizens to join the protests and to occupy Causeway Bay and Mong Kok. The number of protesters peaked at more than 100,000 at any given time, overwhelming the police thus causing containment errors. Government officials in Hong Kong and in Beijing denounced the occupation as "illegal" and a "violation of the rule of law", and Chinese state media and officials claimed repeatedly that the West had played an "instigating" role in the protests, and warned of "deaths and injuries and other grave consequences." The protests precipitated a rift in Hong Kong society, and galvanised youth – a previously apolitical section of society – into political activism or heightened awareness of their civil rights and responsibilities.