By Nidal al-Mughrabi and Jeffrey Heller GAZA/JERUSALEM (Reuters) - Palestinian militants resumed rocket attacks on Tel Aviv on Monday after a 24-hour lull in strikes on the Israeli commercial capital, and Israel kept up its air and naval bombardments of the Gaza Strip despite growing Pressure for a ceasefire. The military said it had shot down a drone from Gaza, the first reported deployment of an unmanned aircraft by Palestinian militants whose rocket attacks have been regularly intercepted. Around half a dozen Israelis have been wounded since the start of the week-old offensive, which Gaza health officials say has killed 169 Palestinians, most of them civilians. International calls for a ceasefire have grown as the death toll has mounted in the worst flare-up of Israeli-Palestinian violence for almost two years, sparked by the murder of three Israeli teenagers and revenge killing of a Palestinian youth.