The Spanish league is working with Espanyol to identify those involved in the field invasion that forced Barcelona players to cut short their title celebrations and rush into the locker room. (More Football News)

The league said on Monday it was taking action a day after a large group of Espanyol supporters from the ultra section behind one of the goals jumped onto the field following Barcelona's 4-2 win and headed for the players who were singing and celebrating the Spanish league title.

The league and Espanyol were analyzing television images to try to identify the fans and report them to authorities.

Riot police had to stand in front of the player tunnel entrance with shields to prevent the hundreds of fans from going in. Some Barcelona players exchanged words with the fans from inside the tunnel.

The Espanyol supporters threw chairs and other objects before dispersing without any other incidents.

The club apologized, but will likely face sanctions after the investigation. Espanyol is in danger of relegation, sitting second to last with four games remaining.

Barcelona clinched its 27th league title with the win against the regional rival.