Who was Saleh al-Arouri?

Al Jazeera :
A drone strike in Beirut’s southern suburbs of Dahiyeh, a Hezbollah stronghold, killed senior Hamas official Saleh al-Arouri on Tuesday.
The drone hit a Hamas office, leaving six people dead, Lebanon’s state news agency reported.
Hamas confirmed the death of al-Arouri and called it a “cowardly assassination” by Israel, adding that attacks on Palestinians “inside and outside Palestine will not succeed in breaking the will and steadfastness of our people, or undermining the continuation of their valiant resistance”.
“It proves once again the abject failure of this enemy to achieve any of its aggressive goals in the Gaza Strip,” the group said.
Following the news of the death of al-Arouri, mosques in Arura, the occupied West Bank town of north Ramallah, are mourning his death and a general strike has been called in Ramallah for Wednesday.
Here is what to know about the Hamas official killed in Lebanon.
Who was Saleh al-Arouri?
Al-Arouri, 57, was the deputy chief of Hamas’s political bureau and one of the founders of the group’s armed wing, the Qassam Brigades.