"He hit a girl in the neck with a sword and stabbed her in the stomach," a witness told the Keskisuomalainen newspaper.
Walmart security allegedly recovered $358.23 worth of stolen items from Doranda Jo Ussery before she launched the attack.
While violent crime in China is unusual and attacks on children even rarer, there has been a marked uptick in such incidents over the past decade.
He stormed the hospital after stabbing a 25-year-old outside.
Oscar Alvarez reportedly turned himself in to police hours after the attack.
In China, the suspect has been detained and is in police custody.
The Somali attacker had criticized the media for its portrayal of Muslims.
Zakaria Bulhan also charged with five counts of attempted murder in Russell Square attack.
Police shot dead both assailants in Saint-Etienne-du-Rouvray.
The alleged assailant, a 27-year-old man who was under arrest and suspected of using drugs, shouted "Allahu Akbar" ('God is Greatest' in Arabic).
The latest knife attack in the country left two children seriously hurt.