attack April 13, 2018 5:12 pm Shark Detection Tech Could Prevent Attacks A shark detection buoy system sends alerts to lifeguards when a shark nears the beach. Anthony Yanez reports for the NBC4 News at 4 p.m. on Friday, April 13, 2018. US & World Videos 0:59 Runaway zebras corralled in Washington state; one still missing 0:41 MLB will reportedly modify uniforms by 2025 after player complaints 1:40 Charlie Puth reacts to Taylor Swift's ‘The Tortured Poets Department' name-drop 2:52 Severe weather kills at least 5 as tornadoes rip through Midwest and South 0:48 World Central Kitchen to resume operations in Gaza