Rough sleeping is a central part of Andy Burnham's early pledges as Prime Minister.
Kelly Crowd says she was left "shaken" by the incident at Betteshanger and reported it to police.
A 59-year-old man from Deal is arrested in connection with the incident, Kent Police says.
The incident happened on Monday at the junction of Barville Road and Boys Hill Road on the A256.
A plaque is in place at Walmer station remembering the US servicemen who died in the explosion.
The show in Deal, Kent, is the Hot Fuzz actor's first solo art exhibition.
The BBC has learned the five on-call stations that Kent Fire and Rescue Service is proposing to axe.
