UEFA has said "several people" are being treated in hospital for injuries to a protester who parachuted into Munich's Allianz Arena ahead of France's 1-0 win over Germany at Euro 2020.
When the parachutist struck the wires for an overhead camera attached to the roof of the stadium, debris fell on the field and the main grandstand, leaving France coach Didier Deschamps missing.
UEFA called it a "reckless and dangerous" act and said "law authorities will take necessary action".
UEFA said, "This inconsiderate act caused injury to several people who took part in the game, who are now in hospital."
The incident happened just before the start of the Euro 2020 match between the last two World Cup champions. Deschamps was shown ducking into the team dugout to avoid falling debris.
German team spokesman Jens Greitner said, "We as the German Football Federation certainly condemn it, because it was not just him, but there were other people who they put at risk and injured. This is from our point of view. unacceptable." "And this incident is being investigated by the police, the authorities here in Munich and UEFA. But of course we also condemn what happened there. It could have been much worse."
On the parachute of the demonstrator "Get out the oil!" was the slogan. And "Greenpeace" written on it. He slid into the stadium and seemed to lose control after joining the wires. He moved from the playing area to the main grandstand and barely cleared the spectators' heads.
The parachutists managed to land, and the German players Antonio Rudiger and Robin Gosens were the first to approach them. He was taken away by the security steward and given medical treatment on the side of the field.
UEFA and one of its top-tier tournament sponsors, the Russian state energy firm Gazprom, have previously been targeted by Greenpeace protests. In 2013, a Champions League game at FC Basel was disrupted when Greenpeace activists went from the roof of the stadium to unfurl a banner opposing Russian Oil and Gazprom, which had sponsored the visiting team, German club Schalke 04.
Greenpeace later donated the money to a charity backed by Basel, which was fined by UEFA for a security lapse.
UEFA defended its environmental credentials in Tuesday's statement.
UEFA said, "UEFA and its partners are fully committed to a sustainable Euro 2020 tournament," and a number of initiatives have been implemented to offset carbon emissions.