A few weeks ago, footage showing asylum seekers, including young children, being rounded up, taken to sea and abandoned on a raft by the Greek Coast Guard was sent to The New York Times.Matina Stevis-Gridneff, The Times’s bureau chief in Brussels, discusses how she proved the truth of the tip that a major European government was carrying out an illegal scheme risking the lives of civilians.Guest: Matina Stevis-Gridneff, the Brussels bureau chief for The New York Times.Background reading: Greece has said that it doesn’t ditch migrants at sea. But it was caught in the act.The Times’s investigation into the video points to a slew of Greek, European Union and international law violations.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.