The Brazil star was in tears after the shock quarter-final defeat following penalties in Qatar.
Brazil was considered a favorite to win the tournament.
Local media suggested the mysterious object could have been a drone that flew from the Ukrainian war zone hundreds of miles away.
“This is like Hiroshima - half of the city no longer exists,” the mayor of the hard-hit town of Petrinja said.
The 65-year-old's leg was crushed after the monument in Split, Croatia, fell the wrong way.
Kay Longstaff fell off the back of a cruise ship spending 10 hours treading waters before being rescued.
Kay Longstaff, 46, was rescued from the Adriatic Sea by the Croatian coast guard on Sunday.
The demonstrators stormed the field during the second half of the match between France and Croatia.
France's 4-2 win brought the nation its first title since 1998.