CERN re-conducted the experiment that had previously reported to have observed neutrinos traveling faster than the speed of light. The original experiment has been a source of controversy and was ultimately determined to have likely been caused by a faulty cable leading researchers to believe neutrinos had traveled faster than light. CERN conducted a similar experiment dubbed Icarus that was conducted at the Italian Grande Sasso laboratory.
Icarus timed the speed of neutrinos traveling from CERN to Gran Sasso using the same short pulsed beam from that controversial experiment last September. The experiment report said that the new measurement “is at odds with the initial measurement reported by OPERA last September.” In other words, the Icarus experiment did not observe neutrinos moving faster than light.