SEATTLE, Wash. (KING) - A suspicious item was detonated outside the FBI offices in downtown Seattle Monday morning.

Officers have since learned the item was not an explosive and did not pose a threat.

The item was first spotted by security guards around 2:00 a.m. outside the Abraham Lincoln building.

The item contained a blinking red light, according to FBI spokesperson Ayn Dietrich.

It was found on top of a metal grate that surrounds a sidewalk tree.

Police were concerned because the building houses FBI offices.

As a precaution, a bomb squad robot was used to detonate the item.

Dietrich said officers later learned the item was not a threat and not explosive.