U.S., Israel Fear Pickup in Iranian Support of Hamas

Iran’s support for the Palestinian militant group Hamas has diminished significantly in the past three years, limiting Tehran’s influence over talks to end the war in the Gaza Strip, according to U.S. and Israeli officials.

But the longer the war between Israel and Hamas drags on, these officials said, there’s growing concern that Tehran could try to increase arms shipments to Hamas.

On Tuesday, Iran’s Supreme Leader Ayatollah Ali Khamenei called for the replenishing of Hamas’s military arsenal. “The Muslim world has a duty to arm the Palestinian nation by...