The two rival Palestinian factions have failed to heal their political disputes since Hamas fighters expelled Fatah from Gaza in a short war in 2007
The attack comes amid protests over an extradition bill in Hong Kong which raises questions about whether Beijing made attempts to disrupt the protest.
Hong Kong protesters have grown increasingly concerned about legal repercussions as Beijing tightens its influence over the former British colony and the local government prosecutes demonstrators, reports Bloomberg. The protesters are thus relying on
encrypted services such as Telegram to avoid detection.
Telegram did not immediately respond to a request for more details on the attack.