More likely to be police overreaction.
They are currently on high alert and take no chances.
When at work I used to go regularly to a large government establishment. They always examined the hire car I usually arrived in with a mirror to see if I had a bomb underneath it, and on high alert examined the engine. On one such occasion, an alarm was raised by a green and yellow wire attached by a screw tag to the engine block. I said it looked like an earth wire. I was asked to move the car to a site with earth banks around it and an expert appeared.
He eventually pronounced it a 'temperature sensor' and I was allowed in.
Later I had a look myself and traced the wire to the battery, where it was firmly attached to the negative pole! Clearly, it was an earth wire as the colour implied. But had they not been satisfied, they were preparing to blow it up with a 'controlled explosion'. It wouldn't have worried me. It wasn't my car.
They get twitchy on high alert.