Attacks against aid workers are on the rise. In the last year, 155 aid workers have been killed in the line of duty, many in some of the most volatile conflicts in the world – Afghanistan, Syria, South Sudan and Somalia.

On World Humanitarian Day join us for the launch of 'Aid in Danger: The Perils and Promise of Humanitarianism' by Larissa Fast - a hard look at violent attacks against aid workers on the frontlines of humanitarian crises.

Based on more than a decade of research documenting and analysing attacks and killings of aid workers on the frontlines of humanitarian crises, the book looks at the causes of violence against aid workers, and reveals how many of the security methods aid agencies use to protect themselves against attacks have proven to undermine humanitarian efforts.

Chaired by BBC World Affairs Correspondent Mike Wooldridge, the event will also see first-hand accounts from experienced aid workers on providing aid in war zones, including Syria and South Sudan. The event will precede the inaugural National Memorial for Humanitarian Aid Workers, to be held at Westminster Abbey at 5 pm.