AAP national convener Arvind Kejriwal on Tuesday termed the explosion in Mohali “a cowardly act” of those who want to disturb peace in Punjab and asserted that his party's government in the state will ensure the culprits get the “strictest punishment”. A rocket-propelled grenade hit the Punjab Police' intelligence wing headquarters around 7.45 pm on Monday. The explosion shattered the window panes on one of the floors of the building.