Yehiyeh Sinwar, the Hamas militant group’s leader in the Gaza Strip, speaks to foreign correspondents in his office in Gaza City on Thursday. “What’s the problem with hundreds of thousands breaking through?” he said. The border fence, he said, was not a “sacred cow.”

Yehiyeh Sinwar, the Hamas militant group’s leader in the Gaza Strip, speaks to foreign correspondents in his office in Gaza City on Thursday. “What’s the problem with hundreds of thousands breaking through?” he said. The border fence, he said, was not a “sacred cow.