Apple has filed a patent application that would allow iPhone users to call 911 using their fingerprints. The feature could recognize the way a person touches a device's screen to prompt a call to emergency services, according to the filing on Tuesday.Once an alert is activated, the phone will send its location to first responders. It could also livestream video or audio footage from the device. "The present invention relates generally to electronic devices, and more specifically to electronic devices that execute commands in response to receipt of biometric or other information including certain predetermined commands," the application says.Apple iPhones already allow users to make emergency calls from locked screens, but the new technology would allow a potential victim to appear to comply with an attacker while dialing 911. Users could also create specific combinations that make it seem as if they're unlocking their devices while simultaneously notifying police. The feature is Apple's latest venture into biometric authentication, a security process that verifies a user's identity based on physical features or behavior, such as how he types or swipes a screen.