Police provided first aid to a 12-year-old boy who fell through a skylight at a Palmerston North primary school on Friday night.

Companies associated with a well-known Auckland restaurant chain have had more than $34 million in assets seized by police seeking to recover "ill gotten gains".

Civil proceedings began on Monday, police said in a statement. They didn't name the company saying suppression orders are in place.

The proceedings are the result of an investigation involving Immigration NZ, the Labour Inspectorate, Inland Revenue and Police.

The matter is due before the High Court in Auckland in early 2016.

Police Financial Crime Group detective inspector Paul Hampton said Government agencies had worked together to detect and prosecute offenders and "recover ill-gotten gains".

"To those who profit from criminal activity, beware", Hampton said.

Immigration New Zealand general manager Peter Devoy said agencies would work together to identify people profiting from immigration related criminal activity.