Physicists from Cern, the Swiss home of the Large Hadron Collider, announced last week that for the second time in a matter of months they had proved Albert Einstein's theories wrong.
If true, the findings would revolutionise the world of science and change more than a century of thinking on modern physics.
However, scientists studying the same neutrino particles that their colleagues say appear to have travelled faster than light have this weekend rejected their claims, saying tests had shown it must be wrong.
It was first announced in September by a team working on the OPERA experiment at the Gran Sasso underground laboratory near Rome that they had recorded the faster-than-light finding.
The scientists said they had recorded neutrinos beamed to them from the CERN research center in Switzerland as arriving 60 nanoseconds before light would have done.
The same team revealed last week that after running a modified follow-up test, they recorded exactly the same results as before.
However, a different team of physicists involved in ICARUS, an experiment also at Gran Sasso, this weekend disputed the claims. Read More