The daughter of an Iranian Arab activist killed in the Netherlands last month linked his death to political conflict in the Middle East, and warned other exiles in Europe to be on their guard.

Ahmad Mola Nissi, 52, was gunned down by an unidentified assailant in front of his home in The Hague on Nov. 8 in a suspected political killing.

Hawra Ahmad Nissi said her father’s death was reminiscent of a string of murders of Iranian dissidents in Europe in the 1990s.