Police say the three men arrested and questioned in connection with the alleged beating of an elephant have been bailed.
Leicestershire Police said:
"We are currently carrying out an investigation in connection with the unnecessary suffering to an elephant at Twycross Zoo.
"Three people have been arrested in connection with the incident and have been released on police bail pending further inquiries."
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Ahead of the conference, calls are growing for Midlands regions to have their own devolved powers to match those on offer to Scotland.
After a cool start, Sunday looks set to be a dry and bright day, with sunny spells.
Mainly dry with clear spells but possibly one or two light showers near coasts overnight, remaining largely dry on Sunday.