(KUNA) -- Four persons including an official of a political party were wounded in a loud motorcycle bomb explosion in a northern Pakistani city on Monday, said police and witnesses. A time-bomb attached to a stolen motorcycle exploded with a huge bang near Green Hotel in the Sadar area of Peshawar city, 250 kilometers north of Islamabad, police sources told KUNA.A witness, Shehreyar Yousuf, said explosion tore motorcycle into several parts and shattered window panes of the hotel and an adjacent bank buildings and several nearby shops. He said the vehicle of Secretary of Awami National Party (ANP), Aqil Shah, was also caught in the explosion. Including Aqil Shah, a bank bodyguard, hotel owner and a passer-by were seriously injured, he added. It was not immediately known whether the target was ANP secretary Aqil Shah. Police terming it a terrorist act said investigations have been launched.