BEIRUT (Reuters) -Deputy Hamas chief Saleh al-Arouri was killed on Tuesday night in an Israeli drone strike on Beirut’s southern suburbs of Dahiyeh, a stronghold of the allied Lebanese militant group Hezbollah, signalling the conflict between Hamas and Israel could be expanding to engulf more of the region. In response to questions from Reuters, the Israeli military said it does not respond to reports in the foreign media. Lebanon’s national news agency said the drone struck a Hamas office. Two security sources said the strike had targeted a meeting between Hamas officials and Lebanon’s Sunni …