The day after Ethiopian Airlines Flight 302 crashed shortly after takeoff in Ethiopia, a Washington, D.C. grand jury issued a broad subpoena naming at least one person with knowledge of how Boeing’s 737 Max jets are made, The Wall Street Journal reports. The subpoena, dated March 11, seeks documents—including correspondence, emails, and text messages—regarding the jet’s development, the paper reports. The inquiry reportedly seeks to ensure that no records were destroyed in the days following the crash that killed 157 people from more than 30 countries. The probe also involves at least one prosecutor from the fraud section of the Department of Justice’s criminal division. The documents must be turned over to the jury within a month.