Police in Aurora, Colorado say that hundreds of street racers were able to shut down a major interstate on Sunday.

The Aurora Police Department said on Sunday night that “I-225 Southbound from Alameda to Colfax is gridlocked due to street racers blocking and interfering with traffic.”

Police say that between 600 and 800 vehicles were involved in the street racing event and that the people involved were “intentionally blocking the shoulders preventing police from accessing the area.”

Authorities also reported the use of “fireworks and smoke and weapons being waved.”

Police were able to clear away the street racers before midnight on Sunday but warned that “it is likely the group will continue engaging in street racing in various areas tonight to include the 33rd & Telluride area. Officers continue to try to manage the situation.”

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