Oak Brook County Police have revealed that a suspicious package which led to the evacuation of over 1,000 workers from MacDonald's headquarters on Friday did not contain any explosive devices.

The authorities have reported in a statement that the DuPage County Bomb Squad discovered the package only contained a digital music player.

Reports indicate that the police was contacted at about 10:42 a.m. on Friday morning after employees at the facility were confounded about a suspicious package. The police statement notes that MacDonald's security team had "in an abundance of caution" evacuated all the 1,300 employees in the building.

It is unclear what marked the package as a source of threat and who it was meant to be delivered to. Although MacDonald restaurants in the US have not been the target of any terrorist attack, the company's outposts in Taiwan, India, Britain, France and Russia have been affected by bomb attacks in the past.

Reports indicate that the building, which is the company's global headquaters, was re-opened at 1:30 pm.

US law enforcement and security operatives have been on high alert following threats from Islamic terrorists to attack the country. Last month, officials disclosed that investigators have intercepted the communication of terrorists in Mexico, who are allied to ISIS and Al Qaeda. This is the closest the radical jihadists have come to US soil. Officials have warned that the terrorists are planning to carry out an attack on the country soon.

MacDonald's Corporation, which is famous for its hamburgers, operates one of the world's largest fast food restaurant chains. The eatery boasts of about 35,000 outlets in 119 countries. It is unclear how the management of the company will react to this incident. Reports indicate that most employees did not return to work on Friday as it was already past their closing time when the cops announced the place is safe.