Read a Q&A with Conrad Hackett, associate director of research and senior demographer at Pew Research Center, on estimating the European Muslim population.
Thirty-eight European governments harassed religious groups in limited or widespread ways in 2015, while 24 used some type of force against religious groups.
This weekend marks 20 years since the Srebrenica massacre – the killing of 7,000-8,000 Muslim men and boys by Bosnian Serb forces in a Bosnian town that had been designated a United Nations safe haven.