BEIRUT — Pagers used by hundreds of members of the militant group Hezbollah exploded near simultaneously in Lebanon and Syria on Tuesday, killing at least nine people — including an 8-year-old girl — and wounding several thousand, officials said. Hezbollah and the Lebanese government blamed Israel for what appeared to be a sophisticated, remote attack.

Among those wounded was Iran’s ambassador to Lebanon. The mysterious explosions came amid rising tensions between Israel and Iran-backed Hezbollah, which have exchanged fire across the Israel-Lebanon border since the Oct. 7 attack by Hamas that sparked the war in Gaza.

The pagers that blew up had apparently been acquired by Hezbollah after the group’s leader ordered members in February to stop using cellphones, warning they could be tracked by Israeli intelligence. A Hezbollah official said the pagers were a new brand, but declined to say how long they had been in use.

At about 3:30 p.m. local time on Tuesday, as people shopped for groceries, sat in cafes or drove cars and motorcycles in the afternoon traffic, the pagers in their hands or pockets started heating up and then exploding — leaving blood-splattered scenes and panicking bystanders.

It appeared that many of those hit were members of Hezbollah, but it was not immediately clear if others also carried the pagers.

The blasts were mainly in areas where the group has a strong presence, particularly a southern Beirut suburb and in the Beqaa region of eastern Lebanon, as well as in Damascus, according to Lebanese security officials and a Hezbollah official.

The Israeli military declined to comment. The explosions came hours after Israel’s internal security agency said it had foiled an attempt by Hezbollah to kill a former senior Israeli security official using a planted explosive device that could be remotely detonated.

State Department spokesman Matthew Miller said the United States “was not aware of this incident in advance” and was not involved. “At this point, we’re gathering information,” he said.

Experts said the pager explosions pointed to a long-planned operation, possibly carried out by infiltrating the supply chain and rigging the devices with explosives before they were delivered to Lebanon.

One online video showed a man picking through produce at a grocery store when the bag he was carrying at his hip explodes, sending him sprawling to the ground and bystanders running.

At overwhelmed hospitals, wounded were rushed in on stretchers, some with missing hands, faces partly blown away or gaping holes at their hips and legs, according to AP photographers. On a main road in central Beirut, a car door was splattered with blood and the windshield cracked.

Lebanon’s health minister, Firas Abiad, told Qatar’s Al Jazeera network at least nine people were killed, including an 8-year-old girl, and some 2,750 were wounded — 200 of them critically — by the explosions. Most had injuries in the face, hand, or around the abdomen.

It appeared eight of the dead belonged to Hezbollah. The group issued a statement confirming at least two members were killed in the pager bombings.

“We hold the Israeli enemy fully responsible for this criminal aggression that also targeted civilians,” Hezbollah said, adding that Israel will “for sure get its just punishment.”