though he did not elaborate on what that particular threat was, he said there were no explosives found despite the reports in german media that an ambulance outside or inside the stadium containing explosives were found. erica? claudio lavanya there for us, thank. russia, meantime, offering a $50 million reward to find the terrorists who blew up a passenger jet over the sinai peninsula, killing the 24 people. russia now saying a bomb roughly the equivalent of two pounds of tnt exploded onboard that plane nearly two weeks ago. an egyptian official tells nbc news two employees from the sharm el sheikh airport have been detained in connection with the bombing. russian president vladimir putin is vowing imminent retribution. ayman mohyeldin is live for us in cairo this evening. good evening. reporter: good evening, ereka. the news was probably not much of a surprise from western intelligence agencies and others. they ve already, if you recall,