Villarreal V Celta Vigo

Anyway watch this game on sky and see what happened towards the end,

87 minutes gone some Idiot decided it would be a good idea to throw a canister on the pitch, At first it looked like it was just smoke but there is a high chance it was Tear Gas
players rushed off pitch, Keeper could not open his eyes and fans went rushing out of the stadium covering their eyes.

about ten minutes later the players came back onto the pitch but there was no officials or fans, The ref then decided the game could go ahead so they let the fans back in

When the game restarted Celta Vigo scored a great free kick to win 2-0

It was delayed about 25 minutes in the end just to finish the 3 minutes plus 3 minutes injury time.

How does a fan get in to the stadium with Tear Gas