FIREFIGHTERS were called to South Parade Pier after a suspicious white powder was found on the promenade.
The Hazardous Materials team, known as Hazmat, were called at 9.25am yesterday along with police.
But tests identified it as harmless flour.
Watch manager Tim Pringle, from Cosham fire station, said it had transpired that it had been left by a jogging club as a trail.
He added: ‘Some people use sawdust, some flour. At every fourth lamppost there was a clump of it.