Essex Police raced to the scene and were spotted directing customers out of the mall as fire alarms sounded throughout the centre.
Unconfirmed reports suggest officers were called following suggestions of a bomb scare after a suspicious package was discovered in Primark.
An anonymous eyewitness told Essex Live: “I believe that there’s been a fire alarm set off and everyone has been evacuated.
“I can see that there are police standing outside of Primark, but I am unsure about the other entrances.
“I can see a few [police officers], and everyone just seems quite confused really.
“It looks like people are being allowed to go back through into the Harvey Centre now.”
Some people took to social media to find out what was happening after they were escorted out the building.
One Twitter user said: “Yooo the Harvey centre Harlow has been evacuated because of a bomb scare in primark !!! Maudddd.”
Another tweeted: “There’s a bomb scare in the harvey centre and I still have to go to work :/“