Facebook designed its Safety Check to find out about people who are close to an affected area during an emergency.

On Sunday, after a terror attack in Lahore, Pakistan, killed around 65 and injured over 300 people, a bug in the tool made it contact people in locations like the U.S., India and U.K. far removed from the explosion.

Some users got text messages on their mobile phones that simply asked: “Facebook Safety Check: Are you affected by the explosion? Reply SAFE if you’re ok or OUT if you aren’t in the area,” without mentioning where the explosion had happened. Others got more specific messages asking them if they were in the area affected by the explosion in Gulshan-i-Iqbal Park in Lahore. Facebook later apologized for the error by the tool.

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