G-20 Security Beefed Up in Pittsburgh

<b>Sept. 24: </b>Police in riot gear redeploy after confrontations with protestors near the Strip District in Pittsburgh.

<b>Sept. 24: </b>A demonstrator stands in front of a police line outside Schenley Park in Pittsburgh, Pa.  (Ross Mantle)

<b>Sept. 23:</b> Members of the groups Three Rivers Climate Convergence and the Pagan Cluster march down the streets of downtown Pittsburgh. (AP2009)

<b>Sept. 24: </b>A police officer asks a group to clear the area in downtown Pittsburgh along Liberty Avenue during the G-20 Summit in Pittsburgh.

<b>Sept. 22: </b>A protester holding a sign is seen in between a row of Police officers in Pittsburgh.

<b>Sept. 23: </b> Members of the environmental group Greenpeace are arrested after they hung a banner from the side of the West End Bridge over the Ohio River in Pittsburgh.

<b>Sept. 22: </b>Police officers in riot gear are seen in Pittsburgh. (AP2009)

<b> Sept. 22:  </b>Police officers in riot gear are seen in Pittsburgh.

<b>Sept. 23:  </b>Federal Reserve Bank Police stand guard outside of the bank as security preparations continue before G-20 summit.

<b>Sept. 23:  </b>An activist is seen in police custody on a downtown bridge in Pittsburgh after activists from the environmental group Greenpeace unfurled a large banner from the bridge. 

<b>Sept. 23:  </b>Law enforcement from the Allegheny County police department walk the streets of downtown Pittsburgh, Wednesday in preparation for the G-20 Summit. 

<b>Sept. 23:  </b>Members of law enforcement from the Allegheny Count Police Department walk down an underground parking ramp in downtown Pittsburgh.

<b>Sept. 23: </b>A person walks past lines of state police assembled at Carnegie Mellon University as part of the security preparations for the G-20 Summit in Pittsburgh, Pa.