German Chancellor Angela Merkel has reassured her nation after her government raised security to meet a heightened terrorist threat - declaring that security forces are doing "everything conceivable for our protection".
Ms Merkel's interior minister raised Germany's security level on Wednesday. He cited an increased threat from extremists but didn't give specific details.
Ms Merkel was quoted as telling Bild am Sonntag newspaper: "We want to live free and without fear in Germany - no terrorist threat will dissuade us from that."
The weekly Der Spiegel reported, without citing sources, that an informer told German authorities that al Qaida was planning a possible attack early next year on Berlin's Reichstag parliament building.
Ms Merkel made no comment at the Nato summit in Lisbon.