stockholm listeners commercial radio station mix megapol sweden hear 30 minutes islamic state propaganda song friday hackers take station frequency station owners say mix megapol one sweden big radio station around 1.4 million listeners daily although problem affect listeners southern swedish city malmo somebody interfere frequency use pirate transmitter jakob gravestam market director bauer media group own mix megapol say press release report incident police national post telecom agency song male voice sing english feature lyric sake allah march gate paradise maidens await men love death love life soldier fight day night host popular morning show anders gry friends notice problem listeners call ask go lot people call us happy people vigilant treat seriously gravestam tell website 24malmo hackers play 30 minutes islamic state propaganda swedish radio