*Authorities on three continents thwarted multiple terrorist attacks aimed at the United States Friday, seizing two explosive packages addressed to Chicago-area synagogues and packed aboard cargo jets from Yemen. Parts of the plot might remain undetected, President Barack Obama’s counterterror chief warned.

Obama called the coordinated attacks a “credible terrorist threat” amid worldwide fears that al-Qaida was launching a major new campaign of assaults.

“The United States is not assuming that the attacks were disrupted and is remaining vigilant,” Obama adviser John Brennan said at the White House.

One of the packages was found aboard a cargo plane in Dubai, the other in England. In the U.S., cargo planes were searched up and down the Eastern Seaboard, and an Emirates Airlines passenger jet was escorted down the coast to New York by American fighter jets.

No explosives were found aboard those planes, though the investigation was continuing on at least two.

Obama’s sobering assessment, delivered from the White House podium, unfolded four days before national elections in which discussion of terrorism has played almost no role. The president went ahead with weekend campaign appearances.

The terrorist efforts “underscore the necessity of remaining vigilant against terrorism,” the president said. While he said both packages that contained explosives originated in Yemen, he did not explicitly assign blame to al-Qaida, which is active in the Arab nation and long has made clear its goal of launching new attacks on the United States.

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