Leaving a protected area based on Shabbat desecration

We live in a mixed city, and in our shelter there are both Haredim and secular Jews. Usually we know when we can leave the shelter because the secular people receive a notification on their smartphone and go out. Is it also permitted on Shabbat for us to leave the shelter when they go out? Otherwise, we have no way of knowing that it is permitted to leave. We should note that we live in a relatively dangerous area, with a threat of missiles from Iran and from Lebanon.

Shalom u’vracha 

You may go out on the basis of the notification that they received. 

The notification itself is not necessarily associated with a prohibition. [Although holding a phone on Shabbat is certainly forbidden.]

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