WASHINGTON - The final preparations are underway with only four days left before Presidents Barack Obama's second inauguration in Washington, D.C.

Organizers expect between 600,000 and 800,000 people, which is a fraction of the nearly two million who showed up four years ago.

Despite the drop in attendance, security will be just as tight with thousands of troops, law enforcement agents and police officers on patrol. 

Organizers also say there won't be any problems like in 2009, when thousands were turned away at the last minute.

They've even released a mobile app to help people find their way around.