Terrifying surveillance video shows the moment the UK mass train stabbing suspect stormed into a barbershop armed with a huge knife — just one day before he allegedly carried out his bloody rampage on a London-bound train.

Anthony Williams, 32, was caught on camera pacing outside the barbershop Friday night soon after he allegedly knifed a 14-year-old boy in a separate attack, the Sun reported.

The maniac could be seen whipping out the huge blade and barging into the shop as employees and customers scrambled out of the way just before 7:30 p.m.

It wasn’t immediately clear if anyone was injured in the ordeal.

The chilling saga is one of three knife attacks allegedly tied to the suspect.

It unfolded just minutes after Williams had allegedly stabbed a teen nearby.

The 14-year-old boy wh

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