The incidents, which are being treated as criminal damage, took place on Barbourne Road in Worcester. The first incident happened between Sunday, July 19, and Monday, July 20, while the second occurred between Monday, July 27, and Tuesday, July 28. READ MORE: Worcester paedophile who asked 14-year-old girl for sexual images sentencedA West Mercia Police spokesman said: "An officer looking into the incidents is appealing for witnesses, or anyone who may have information, to please get in contact with police. "If you can help, email PC Nikki Payne by emailing nikki.payne@westmercia.police.uk."