NEW YORK (AP) - Hundreds of chanting demonstrators lined three blocks of Manhattan's Fifth Avenue on Thursday, and dozens lay down in the street in a ''die-in'' to protest the war.

Officers, some in riot gear and on horseback, clamped plastic handcuffs onto about 150 protesters who refused to get up and half-carried them into police vehicles.

Anti-war groups also called for other civil disobedience in the city to protest media and corporate ''profiteering from the war.''

As helicopters hovered overhead, the protesters - some beating drums or chanting ''Hey-hey, ho-ho, Bush's war has to go!'' - jammed police pens near St. Patrick's Cathedral and the Saks Fifth Avenue store.

Organizers of the loose coalition, which calls itself M27, said the ''die-in'' was intended to symbolize Iraqi war victims. A single lane of Fifth Avenue was reopened to traffic after about a half-hour.

Later, a small group staged a mock funeral march, and some protesters took up a ''no business as usual'' theme, including a dozen who blocked an entrance to Tiffany's. But most protesters left the area promptly, and there was little disruption around midtown by late morning.

Organizers said the civil disobedience was aimed at getting their message out.

''Nothing else gets attention,'' said protester Johannah Westmacott. ''It's not news when people voice their opinions.''

The demonstration attracted several counterprotesters, including a man with a red, white and blue bandanna under a hardhat who argued toe-to-toe with a young protester with a pony tail and sideburns.

One counterprotester held a sign that read: ''Traitors, have you forgotten Sept. 11?''

''Whether you're for or against it, we need to pull together,'' said Rachel Harary, 20. ''Put on your flag and get them home.''

Some protest signs were directed at the media. One protester held a sign showing a picture of parrots and the words, ''Don't Parrot the Right-wing Propaganda.''

Another, 44-year-old teacher Lee Whiting, held up a sign that said, ''Embedded? or In Bed?'' Embedded, she said, means ''journalists are presenting almost exclusively the military view of this war.''

Police and security officers placed a web of barricades at the adjacent Rockefeller Center, home of the GE Building, NBC and The Associated Press, to prevent the protesters from staging their ''die-in'' there.