By Brad Brooks, Phil Stewart, Idrees Ali and Dietrich Knauth LOS ANGELES (Reuters) -Hundreds of U.S. Marines arrived in the Los Angeles area on Tuesday under orders from President Donald Trump, as the city's mayor declared a curfew for parts of the downtown area and police arrested 197 people in a fifth day of street protests.

The ongoing protests in Los Angeles began with small demonstrations against immigration raids in the nation's second largest city.

A cloud of uncertainty is hanging over Los Angeles, where questions remain over the role that Marines and National Guard troops will play after being called in by President Donald Trump amid protests over immigration raids in the city.

President Donald Trump warned that the use of the military in response to protests against his illegal immigration crackdown won't be limited to just Los Angeles.

The current unrest in Los Angeles is a lot different from the last time a U.S. president called out the National Guard to respond to violence on the streets

Police detained a CNN crew reporting on protests against immigration raids in Los Angeles. CNN correspondent Jason Carroll said an officer escorted them away from the protest late Monday and warned them to not return.

Trump has deployed 4,000 National Guardsmen and 700 Marines to LA. Tensions are escalating for a third day in Los Angeles after protests against Immigration and Customs Enforcement gripped the city, with demonstrators clashing with law enforcement and setting vehicles on fire downtown.