He then made off and confronted a lone member of the public waiting at the bus stop on Carmarthen Road at the entrance to Tesco car park and assaulting him before fleeing the scene.
Detective Sergeant Sam Stanway of Swansea CID said: “At the time of the incident the store was busy with customers and Carmarthen Road is one of the main arterial roads in the city so there is a strong chance both incidents were witnessed.
“We want to hear from anyone who may have seen either, or both, of the incidents as they unfolded.”
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A 29-year-old man has been arrested on suspicion of assault and attempted robbery.
(Lead image: Google Maps)
