Questions 20 and 21 are based on the following news. At the end of the news item you will be given 20 seconds to answer the questions. Now listen to the news.  A police spokesman said the devices were made safe by explosive experts in the Ardorn district, where a woman was shot in the leg and 13 police officers were injured during a second successive night of violence. Northern Ireland’s police chief had earlier called on community leaders to work together to end the violence. The violence has erupted sporadically throughout a summer of Sectarian tension in northern Belfast. Questions 20 and 21 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions. Now listen to the news. 20. Altogether how many people were injured during the violence?