Are you opening Gmail and having problems, don’t worry it’s not just you, today the Google Apps Status Dashboard shows that a service disruption was picked up for Gmail at 3:25pm BST (10:25am ET, or 07:25am PT).
Many of the users having this similar problem and tweeting with hashtag #gmaildown.
App status for Gmail says that Google is investigating the issue and will provide an update by 9/23/13 10:15 PM.
This article will be updated, when Google will release any update.