European markets lower after tariff threat; Airbus down 1.8%; UK's May to meet Merkel

European stocks were mostly lower Tuesday morning, as market participants prepared for key events this week and responded to a new tariff threat from the U.S.

from World News & Analysis https://www.cnbc.com/2019/04/09/european-markets-brexit-earnings-in-focus-as-mood-turns-cautious.html