If you're having trouble logging into your Instagram account today, you're not alone. A problem is causing some users to be locked out of their accounts, Instagram said Thursday.

The company said it's "working hard" on a fix for the issue, but didn't specify the cause.

We're currently experiencing an issue that may have caused some users to have trouble logging in. We’re working hard to fix it. — Instagram (@instagram) July 16, 2015

Affected users report they were logged out of their accounts and have been unable to log back in. It's unclear how many people are being impacted by the glitch, though many disgruntled users have already moved over to Twitter to complain about the disruption.

Anybody else instagram not working ? — KEN KEN‼️ (@Kendall__Marie) July 16, 2015

When Instagram is down https://t.co/Ztx8x8QWZk — Barstool Sports (@barstoolsports) July 16, 2015

Pray For Instagram — THE SYAFIQ JASNI (@FiqDrewx) July 16, 2015

wtf instagram... — Luke Harwood (@lukeharwood23) July 16, 2015

Waiting for Instagram to work like: pic.twitter.com/cVTsAzgcLO — katelyn卌 (@lukeftlarryy) July 16, 2015

Sort your life out @instagram. Let me log in. You're a mess. — Houssein (@CheekyHoussein) July 16, 2015

We've reached out to Instagram for more information on the issue, and we'll update when we hear back.