Two colonies in Worli area in central Mumbai were sealed, disinfected and fumigated in the early hours of Monday in view of novel coronavirus outbreak, local MLA and Maharashtra minister Aaditya Thackeray tweeted. "Late last night 2 am onwards, Koliwada and Janta Colony have been sealed off further. Disinfection and fumigation is on along with contact tracing," Thackeray tweeted.