Thousands of anti-war protesters marched through the streets of Chicago Sunday, taking their discontent to world leaders assembled for a NATO summit.

The demonstrators had little chance of being seen by the leaders and delegates from 50 countries meeting at a lakeside convention center.

Sunday's protest followed several smaller demonstrations over the previous two days. Most have been peaceful, but police said two men were in custody, accused of planning to make Molotov cocktails for use during the NATO meetings.

On Saturday, three men were charged with with terrorism for possession of explosive devices. Police say they plotted to use the devices in an attack on President Obama's campaign headquarters in Chicago, the home of the city's mayor, Rahm Emanuel, and other targets.