Nato members are preparing to meet in Lisbon. Several hours are left before the summit.
The 28 member states are hoping to reach a "New Strategic Concept" to shape the way Nato defends itself against threats over the next decade.
Law enforcement forces are mobilization in front of the Lisbon International Exposition Center.
Until the end of the summit 25 countries have suspended the free movement between countries in the frame of the Schengen treaty.
The thousands of anti-globalists are gathered in the streets for holding the rallies.
