Men armed with machetes and other weapons arrived at the protest scene and immediately sent protesters and bystanders scampering for safety.
Femi, 58, got to the scene moments later with his son Omorinmade Anikulapo-Kuti.
In a tweet, Femi urged the protesters to continue.
“Got to Alausa a while ago but hijackers had left. Continue the fight!” he wrote.