An Islamist militant group claimed responsibility, citing retaliation for the Israeli attack on Palestinians protesting the death of an inmate in an Israeli prison.
The Assad regime says the attack underscores the need for unity. The opposition has contrasted the regime's lack of response with its relentless attacks on its own people.
And there could well be more of it without them.
Confidence appears to be growing that the Bulgaria bus bombing was part of an Iranian and Hezbollah campaign against Israeli interests abroad.
In an interview with Haaretz, Israel Defense Forces Chief of Staff Benny Gantz acknowledged the threat of a nuclear Iran but said Tehran wasn't likely to go there, citing its 'rational' leadership.
Palestinian rocket fire had spurred Israel-Gaza violence over the weekend, but Hamas – whose militants were not involved – seems eager to end the flare-up.
With Gilad Shalit's scheduled release only a day away, Israelis who fear the consequences of releasing the prisoners are making a final push to derail the deal by petitioning the Supreme Court.
'We are anxiously monitoring what is happening in Egypt and [elsewhere] in our region,' Israeli Prime Minister Benjamin Netanyahu told his cabinet Sunday morning.
Israel says that Iran nuclear sanctions proposed to the UN Security Council are weaker than it would like, but the symbolism of international unity is important.