The battle over Kinder Morgan’s Trans Mountain pipeline returned to B.C. Supreme Court Thursday, and demonstrators took drastic measures to show their opposition.

The energy giant is applying for an expanded injunction that would give it more time to conduct its survey work on Burnaby Mountain, and keep pipeline protesters further away from the site.

Four such protesters showed up at the courthouse this morning and chained their necks to the doors with bike locks to block access to the building.

The demonstration ended about an hour later after a fire alarm was pulled.

Protesters voluntarily unchained themselves after police told them it was unsafe to block the doors during an alarm.

Thursday also saw more arrests on the mountain, including that of Grand Chief Stewart Philip of the B.C. Union of Indian Chiefs.

“I am willing to stand up to Kinder Morgan and be arrested for the future of my grandchildren,” Stewart said in a statement.

The total number of arrests has not been confirmed, but Burnaby RCMP said as of Thursday night officers had arrested 103 people on the mountain.