DAVOS – Swiss police have launched an investigation after a small explosion in a hotel store room during the Davos world economic forum (WEF), BBC reports. The blast shattered two windows but caused no injuries at the Post Hotel Morosani shortly after 0900. Police could not say immediately what was the source of the explosion. According to Swiss media, anti-WEF activists say they attacked the hotel with a firework device. The Post Hotel Morosani is just over 1.5km (one mile) from the annual forum’s venue. With 2,500 political and business leaders attending the summit, security in the small Swiss resort has been tight. Swiss news website 20min.ch received an e-mail from “anti-WEF activists” claiming the attack on the Post Hotel Morosani. The Post Hotel is being used by Swiss bankers during the forum, correcting an earlier report that the Swiss government was using the hotel.