Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: World and religious leaders, politicians and organisations have been reacting to video released by the Islamic State (IS) militant group, purporting to show the beheading of British hostage Alan Henning.

World reacts to IS video showing apparent killing of Alan Henning