Popular social media app Snapchat was down on Wednesday in an apparent widespread outage, with many users facing issues sending and receiving messages.

According to monitoring site DownDetector, almost 40,000 users reported outages on Snapchat, with the reports peaking at 8:48 a.m. ET.

Snapchat users took to Twitter to complain about problems with the app, including trouble sending pictures.

The photo-sharing app tweeted that it was aware of the issue and users should “hang tight” while they deal with the problem.