Authorities investigating whether negligence caused a plane crash in Colombia that killed 71 people have detained the head of the airline.
Gustavo Vargas could face a manslaughter charge over the deaths which included nearly all of Brazil's Chapecoense football team.
Bolivian prosecutors are also questioning along a mechanic and a secretary who worked for LaMia airline.
Footballer David Luiz dedicated Chelsea's win on Saturday to those killed in the Chapecoense plane crash.
The Brazilian player, who had ice strapped to his knee following Sergio Aguero's tackle, declined to speak about the brawl at the end of the match.
He and fellow Brazilian player Willian displayed a black arm band to the crowd during the match.
"I prefer to give this victory to the people in Brazil, Luiz said after the match. "I had some friends there and it's difficult to play this kind of game. We just need to play for the families because it's difficult for everyone."
Players from both sides wore black arm bands in tribute to the 71 people who died in Monday's crash outside Medellin, Colombia.
Barcelona have invited tragedy-hit Chapecoense to play in a pre-season friendly next summer
One of the six survivors of a horror plane crash which killed 71 people has appeared on camera to thank his supporters.
Gustavo Vargas could face a manslaughter charge over the deaths of 71 people, including nearly all of Brazil's Chapecoense football team.