Six people were killed in Bagerhat, Khulna, Patuakhali and Barishal districts as cyclone ‘Bulbul’ made a landfall in Khulna and adjoining southwestern part of the country early Sunday before weakening into a deep depression.   Meanwhile, three other people, who took shelter in cyclone centres, died of cardiac arrest after being panicked in Patuakhali, Satkhira and Barguna districts.