NEW YORK — Just one day after pagers used by hundreds of members of the militant group exploded, more electronic devices detonated in Lebanon Wednesday in what appeared to be a second wave of sophisticated, deadly attacks that targeted an extraordinary number of people. Both attacks, which are widely believed to be carried out by , have hiked fears that the two sides’ simmering conflict could escalate into all-out war. This week’s explosions have also deepened concerns about the scope of potentially-compromised devices, particularly after such bombings have killed or injured so many civilians.

Here’s what we know so far. On Tuesday, pagers used by hundreds of members exploded almost simultaneously in parts of as well as Syria. The attack killed at least 12 people - including two young children - and wounded thousands more.

An American official, who spoke on the condition of anonymity, said briefed the U.S. on the operation - where small amounts of explosives hidden in the pagers were detonated.

The Lebanese government and Iran-backed also blamed for the deadly explosions. The Israeli military, which has a long history of sophisticated operations behind enemy lines, declined to comment. A day after these deadly explosions, more detonations triggered in and parts of Lebanon Wednesday - including several blasts heard at a funeral in for three members and a child killed by Tuesday’s explosions, according to Associated Press journalists at the scene.

At least 25 people w.