The White House says it wasn't aware of the simultaneous pager explosions across Lebanon before the attacks. 

Thousands were injured and at least 12 killed when pagers, used by political group Hezbollah, detonated yesterday.  

Today —a day later— at least nine people are dead and 300 injured after walkie talkies exploded.  

Hezbollah believes Israel is responsible  

US correspondent Benji Hyer told Ryan Bridge there was a quick phone call between the defence secretaries of Israel and the US minutes before pagers started exploding. 

He says Israel told the United States they would be conducting an operation in Lebanon, but no further details were shared. 

LISTEN ABOVE 

• Walkie-talkies explode in Lebanon day after deadly pager attack; fears of all-out-war
• Exploding pagers kill nine, injure thousands in Lebanon in suspected Israeli attack
• Lebanon attack: Expert suspects intentional sabotage caused pagers to explode