A Palestinian Human Rights Lawyer based in the Hague has received death threats from a mysterious but well coordinated source, according to the monitoring group she works with.

Al Haq, a Palestinian NGO which reports on abuses in the occupied Palestinian territories, published a statement claiming that Nada Kiswanson has been subject to sustained threats and abuse. It described ongoing, well-organised and serious attacks, including death threats, interference in communications, intimidation, harassment and defamation from the mysterious source.

Kiswanson represents Al Haq before the International Criminal Court (ICC) and Europe, and is currently cooperating in the Hague’s inquiry into the 2014 Gaza war.

The threats against Kiswanson appear to be sophisticated and wide-ranging. Al-Haq described defamatory flyers being circulated against Kiswanson, calls for her “elimination” being received by her family, and threatening messages that disclosed detailed knowledge of her travel plans and whereabouts.

According to Haaretz, human rights organisation Amnesty International had to close its Hague office temporarily after a death threat was sent from an employee’s hacked email address to Ms. Kiswanson.

The Netherlands is reportedly investigating the allegations.

The ICC probe into criminal responsibility in the Gaza war has been ongoing since 2015, and has been met with resistance from Israel.