Banjir dengan ketinggian muka air 40 hingga 200 sentimeter terjadi di Kelurahan Kotabumi, Kecamatan Grogol, Kota Cilegon, Banten. Banjir terjadi pada Senin (4/5/2020) pukul 12.00 WIB. Badan Penanggulangan Bencana Daerah (BPBD) Provinsi Banten melaporkan bahwa peristiwa tersebut terjadi dipicu oleh intensitas hujan yang tinggi selama 3 jam.
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