Malaysian officials say opposition leader Anwar Ibrahim will face charges stemming from his participation in a demonstration last month.

Authorities say Anwar has received notification to appear in court Tuesday on accusations of violating the Peaceful Assembly Act.

The April 28 rally was held in the center of Kuala Lumpur to demand election reforms.

At least 25,000 protesters trampled through barbed wire barricades as they poured into the heavily guarded Independence Square, defying a ban on holding the rally at the venue in the heart of the capital.

Activists claim that the Election Commission is biased and that Prime Minister Najib Razak's ruling coalition which has held power for more than 50 years, will have an unfair advantage in elections that could be called as early as June.