Lopez said security video shows one person vandalizing his office.
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RELATED: Bricks thrown through window of Alderman Raymond Lopez's Brighton Park office, police say
Lopez tweeted, "The third attack in a month! Lawlessness continues in Chicago."
Alderman Lopez discusses 2nd vandalism at office in 10 days
Alderman Lopez speaks after office vandalized
This is the second assault on the office in ten days, and the third act of vandalism targeting the alderman in a month after bricks were thrown through the windows of his home.
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RELATED: Alderman Raymond Lopez says bricks thrown through windows of his Brighton Park home
The alderman has previously said that gang members are targeting him and Thursday morning, he criticized Mayor Lightfoot for not doing enough.
"I've had enough," Lopez said. "I'm beyond pissed right now because I have to keep having these press conferences and keep calling out what each of us already know in our neighborhoods. We are all under attack by the failed policies that continue to enable and protect the gang bangers in our midst."