U.S. federal agencies are warning citizens anxious to donate money for those victimized by Hurricane Harvey to be especially wary of scam artists. In years past we’ve seen shameless fraudsters stand up fake charities and other bogus relief efforts in a bid to capitalize on public concern over an ongoing disaster. Here are some tips to help ensure sure your aid dollars go directly to those most in need.

The Federal Trade Commission (FTC) issued an alert Monday urging consumers to be on the lookout for a potential surge in charity scams. The FTC advises those who wish to donate to stick to charities they know, and to be on the lookout for charities or relief Web sites that seem to have sprung up overnight in response to current events (such as houstonfloodrelief.net, registered on Aug. 28, 2017). Sometimes these sites are set up by well-meaning people with the best of intentions (however misguided), but it’s best not to take a chance.

The FTC also warns consumers not to assume that a charity message posted on social media is a legitimate, and urges folks to research the organization before donating by visiting charity evaluation sites such as Charity Navigator, Charity Watch, GuideStar, or the Better Business Bureau’s Wise Giving Alliance. The agency also reminds people who wish to donate via text message to confirm the number with the source before you donate.

From the US Computer Emergency Readiness Team (US-CERT) comes a reminder that malware purveyors frequently use natural disasters and other breaking news items of broad interest to trick people into clicking on malicious links or opening booby-trapped email attachments.

If anyone spots additional recently-registered Harvey-themed relief domains, please drop a note in the comments below.

Update, 11:42 p.m. ET: A reader pointed out a newly-registered domain — harveyfloodrelief[dot]org — that is currently requesting PayPal donations on behalf of Harvey victims.