Chicago police bomb and arson unit investigators were able to "resolve" a situation involving a suspicious package in the Pilsen neighborhood this afternoon, police said.

The call came in to police at about 2:51 p.m. for a suspicious package found on the 1600 block of West 18th Place, said Chicago Police News Affairs Officer Veejay Zala.

Investigators were on the scene and traffic was being diverted in the area, according to officials.

The "situation has been resolved" by about 5 p.m., said Chicago Police News Affairs Officer Darryl Baety, who did not have details.

A police source said preliminary information indicates that the suspicious package is believed to be a stick of dynamite. Officials said it was found in a garbage can in front of a building.

Officials from Benito Jurez High School, 2150 S. Laflin St., ordered the school on lockdown as a precaution as investigators deal with the incident, according to a Chicago Public Schools spokeswoman.

While most students had already left for the day, between 100 to 150 students had remained in the building for after school activities. Those students and staff will be required to stay in the building until police and fire officials say it is safe to leave, according to the spokeswoman.

Officials  said several businesses in the area were evacuated and CTA buses were being rerouted.