The suburban city of Highland Park, Illinois, is grieving after seven people were shot dead and 30 were injured during a Fourth of July parade Monday.

Police say a preliminary investigation shows a lone gunman opened fired on parade attendees during the morning Independence Day celebration. A high-powered rifle was recovered at the scene, police said. 

Lake County Major Crime Task Force spokesman Christopher Covelli said the gunman apparently fired from a rooftop at around 10:14 a.m. after climbing there on an unsecured fire escape ladder attached to the building. 

No charges had been announced as of Tuesday morning, but police took 21-year-old Robert “Bobby” E. Crimo III into custody Monday night after the shooting.

Highland Park is a city of about 30,000 people about 25 miles north of downtown Chicago.

During a press conference Tuesday, Highland Park Mayor Nancy Rotering said the city would release information on its website (https://www.cityhpil.com/) later in the day about where to donate.

“Be mindful of potential scams,” Rotering said. “This afternoon we’ll share additional information on the city’s website regarding how to donate to the victims, survivors and those who support the community.”

For now, here is how you can help:

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Verified fundraisers

The crowdfunding website GoFundMe on Tuesday launched a hub of verified fundraisers related to the Highland Park parade shooting to aid victims and their families.

The hub is regularly updated as new fundraisers are verified by the organization, according to spokesperson Monica Corbett.

As of Tuesday, the following had been verified:

As of midday Tuesday, the fundraisers had collectively raised more than $250,000.

Blood donations

If you’re in the area, you can donate blood.

Gunshot victims require as much as 10 times more blood than those suffering from non-gunshot injuries, according to an analysis released in 2018 by Johns Hopkins Medicine researchers. 

The Red Cross “has not received requests for blood products” in response to the Highland Park shooting, the organization said in a statement to USA TODAY Tuesday afternoon