Police in Cologne have a suspect in custody and are hunting for another after an explosion in the early hours of Wednesday destroyed a cafe. But police investigators don’t believe the suspects are involved in a series of other mysterious blasts that have unsettled the western German city in recent weeks. Local residents reported hearing a blast in the outlying district of Pesch around 2:45 am (0045 GMT), according to Cologne police. Shortly afterwards, the café on the ground floor of an apartment building was engulfed in flames. The exact cause remains unclear, according to the authorities. A …