Heavy security presence established in NYC ahead of 9/11
A day ahead of Sept. 11, police have established a heavy security presence across the region.
Click "NEXT" for more on the preparations being made at Ground Zero.
Thousands of police officers are on patrol, some even armed with automatic weapons.
Police have also set up security checkpoints at bridges, tunnels, subway and train stations.
The ramped-up security comes at the same time as officials say they received a credible but unconfirmed threat against targets in New York City and Washington, D.C.
Officials say they are looking for three men, two of who are American citizens, who may be plotting on detonating car bombs on a bridge or inside a tunnel. They are also looking for three vans reported stolen recently.
Thousands of people will be traveling to Lower Manhattan tomorrow to attend the Sept. 11 memorial service at Ground Zero.
Government agencies step up security efforts amid terror threatOfficials chase unconfirmed al-Qaida bomb plot