A statement from the office of U.N. Secretary-General Ban Ki-moon said the blast, and other violence throughout Syria, "call into question the commitment of the parties to the cessation of violence."
Observer mission leader Norwegian Major General Robert Mood was part of the convoy and condemned the attack. He is quoted by his spokesman as saying it was "an example of what the Syrian people were suffering on a daily basis" and that "all forms of violence must stop."
U.S. State Department spokeswoman Victoria Nuland called the bombing "another example of why we have got to continue to put the pressure on the Assad regime." She "the bulk of the responsibility" for the violence is in the hands of Syrian President Bashar al-Assad.
"This is another example of why we've got to continue to put the pressure on the Assad regime," said Nuland. "It is further evidence that the cease-fire is not holding and we really have to continue to pressure the Assad regime and all actors and this is further to why we've got to get the monitors into as many places as we can. We continue to put the bulk of the responsibility for the violence in Syria at the hands of the regime."