Agreement signed, Biejat-Holownia duel, Braun investigation

Magdalena Biejat and Szymon Holownia faced off in Gdynia. The prosecutor's office has returned to the case of erstwhile Prime Minister Beata Szydło's accident in Oświęcim. The United States and Ukraine have signed an economical partnership agreement. Here are 5 things to know on Thursday, May 1.