U.S. planes pounded Islamic State positions in Syriafor a second day on Wednesday, but the strikes did not halt the fighters’ advance in a Kurdish area where fleeing refugees told of villages burnt and captives beheaded.

U.S. President Barack Obama, speaking at the United Nations, asked the world to join together to fight the militants and vowed to keep up military pressure against them.

“The only language understood by killers like this is the language of force, so the United States of America will work with a broad coalition to dismantle this network of death,” Obama said in 40-minute speech to the U.N. General Assembly. […]