The Israeli military launched a major offensive in the Hamas-ruled Gaza Strip on Tuesday, striking more than 100 sites and mobilizing troops for a possible ground invasion in what Israel says is an operation aimed at stopping a heavy barrage of rocket attacks from the Palestinian territory.

At least 15 Palestinians, including three children, were killed in the attacks from air and sea, Palestinian medical officials said.

The military said the open-ended operation aims to deliver a blow against the Islamic militant group, and end the rocket fire that has reached deeper into Israel in recent days. […]