How it works:
If an account was accessed from one country and a few hours later it was logged into from another, that may raise an alert, because it might mean that the account is has been hijackecked.
Click on "Show details" next to the message, you'll see the last account activity window with the most recent access points.
If you believe your account has been accessed by an authorised user, you can change your password in the same window. Or, if you are aware who/why used your account (you or family members traveled abroad) , you can click "Dismiss" to remove the message.
[Source: Gmail Blog]
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