A school cleaner, savagely beaten and robbed in a classroom, last night spoke of his terrifying ordeal.

Two thugs walked into a classroom at Kelston Primary School, west Auckland and rained blows on Baosham Han before stealing his wallet.

The attack came less than a week after Tokoroa teacher Lois Dear was beaten to death in her classroom at Strathmore Primary School.

Mr Han, 43, said the two men moved quietly behind him before punching and kicking him to the ground, breaking his nose. "I heard about the teacher and now it's happening to me."

Chinese-born Mr Han, who is bruised and cut with swelling to the head, said he no longer felt safe in this country.

The cleaner - who has a wife and son - has been here three years and became a New Zealand citizen last year.

He was cleaning his last classroom of the day when he was attacked. "I didn't have much time to react. They pushed me on the ground and punched and kicked me."

The two offenders, described as Maori or Pacific Islanders between 16 and 20, stole Mr Han's wallet and cellphone. Forensic officers have examined the school for clues but last night police had no leads on the attackers.

Principal Rod Harry said Kelston had no policy for locking the buildings while they were cleaned.

"I guess you can try to have a policy on these things but it is not easy to make sure you are inside and locked each time, because as soon as you come out the door you are vulnerable."