Hundreds of protesters met Bush and police bomb squads disposed of several fake bombs, the BBC reported.
The meeting was hosted by Austrian Chancellor Wolfgang Schuessel, who urged Bush to shut down the U.S. military prison for terror suspects in Guantanamo Bay, Cuba. Austria holds the rotating EU presidency.
For Bush's part he asked Europe to honor aid pledges totaling $13 billion to the Iraqi government, and for solidarity in dealing with Iran's nuclear program and North Korea's apparent pending ballistic missile test.
At a news briefing, Bush was asked about Iran's intention to respond to a nuclear concessions package on Aug. 22.
"It shouldn't take the Iranians that long to analyze what is a reasonable deal," Bush said.