ISTANBUL   Israeli warplanes launched an airstrike on senior Hamas leaders in the Qatari capital Doha on Tuesday, in a new blow to efforts to reach a Gaza ceasefire deal. Explosions were heard in Doha, with footage showing plumes of smoke rising into the sky. The Israeli army said it conducted a “precise strike” targeting the senior Hamas leadership, without specifying the location. A senior Israeli official told the Walla outlet that the strike targeted senior Hamas leaders in Doha. A senior