With the protest on Wall Street entering its fourth week, police officers are keeping their posts surrounding the park at the center of it all as the Occupy Wall Street demonstrators say they are staying put for the long haul.

The protesters say they’re fighting for the “99 percent,” or the vast majority of Americans who do not fall into the wealthiest 1 percent of the population; their causes range from bringing down Wall Street to fighting global warming. The movement gained traction through social media, and protests have taken place in several other cities nationwide.

On Monday, the Rev. Al Sharpton and rapper Kanye West made impromptu appearances at the park