Catalonia is on edge as former president Carles Puigdemont prepares to return from exile to attend the investiture debate of Salvador Illa, scheduled for 10 AM today.

Puigdemont's arrival is fraught with uncertainty, as he faces a national arrest warrant related to the 2017 independence referendum.

Supporters from various pro-independence groups are gathering at 9 AM near the Parliament to welcome him, while security measures are heightened with over 400 police officers deployed.

The potential for Puigdemont's arrest looms large, which could lead to the suspension of the investiture session.

As tensions rise, both pro-independence and far-right groups plan demonstrations, setting the stage for a politically charged day in Barcelona.