(ASSOCIATED PRESS)
Just one day after pagers used by hundreds of members of the militant group Hezbollah 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 Israel, have hiked fears that the two sides’ simmering conflict could escalate into allout war. This week’s explosions have also deepened concerns about the scope of potentiallycompromised devices, particularly after such bombings have killed or injured so many civilians.

Here’s what we know so far.

What happened across these two waves of attacks?
On Tuesday, pagers used by hundreds of Hezbollah members exploded almost simultaneously in parts of Lebanon 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 Israel briefed the U.S. on the operation — where small amounts of explosives hidden in the pagers were detonated. The Lebanese government and Iranbacked Hezbollah also blamed Israel for the deadly explosions. The Israeli military, which has a long history of sophisticated operations behind enemy lines, declined to comment.

At least nine people were killed and another 300 were wounded, the Health Ministry said, in this apparent second attack.

When speaking to troops on Wednesday, Israeli Defense Minister Yoav Gallant made no mention of the explosions of electronic devices, but praised the work of Israel’s army and security agencies and said “we are at the start of a new phase in the war.”

What kinds of devices were used?
A Hezbollah official told the AP that walkietalkies used by the group exploded on Wednesday. The official spoke on condition of anonymity because he was not authorized to speak to the media. Lebanon’s official news agency also reported that solar energy systems exploded in homes in several areas of Beirut and in southern Lebanon, wounding at least one girl.

While details are still emerging from Wednesday’s attack, the second wave of explosions targeted a country that is still reeling from Tuesday’s pager bombings. That attack appeared to be a complex Israeli operation targeting Hezbollah, but an enormous amount of civilian casualties were also reported, as the detonations occurred wherever members’ pagers happened to be — including homes, cars, grocery stores and cafes.

Hezbollah has used pagers as a way to communicate for years. And more recently, Hezbollah leader Hassan Nasrallah warned the group’s members not to carry cellphones, saying they could be used by Israel to track the group’s movements.

Pagers also run on a different wireless network than mobile phones, which usually makes them more resilient in times of emergency. And for a group like Hezbollah, the pagers provided a means to sidestep what’s believed to be intensive Israeli electronic surveillance on mobile phone networks in Lebanon — as pagers’ tech is simpler and carries lower risks for intercepted communications.

Elijah J. Magnier, a Brusselsbased veteran and a senior political risk analyst who says he has had conversations with members of Hezbollah and survivors of the attack, said that the newer brand of pagers used in Tuesday’s explosions were procured more than six months ago. How they arrived in Lebanon remains unclear.

Taiwanese company Gold Apollo said Wednesday it had authorized use of its brand on the AR924 pager model — but that a Budapest, Hungarybased company called BAC Consulting KFT produced and sold the pagers.

Taiwan’s Ministry of Economic Affairs said that it had no records of direct exports of Gold Apollo pagers to Lebanon. And Hungarian government spokesman later added that the pager devices had never been in Hungary, either, noting that BAC had merely acted as an intermediary.