but now, once again, it is bringing nights of terror and death to yemeni civilians. 0rla guerin, bbc news. let's turn to coronavirus come an hour. —— let's turn to coronavirus, now. the brazilian cities of rio de janeiro and sao paulo have delayed their carnival parades untill the end of april, in the face of record covid cases in the country. both cities had already canceled their carnival street parties, but were still considering having their samba parades at the end of february. on wednesday the country recorded 204,854 new daily cases, the most reported in a 24—hour period since the pandemic began. brazil has also stepped up its vaccination program for young children. earlier, the brazilian ministry of health approved the use of the chinese—made sinovac jab for 6—17 year olds. the vaccine was the first to be used in brazil, but has since laregly been