Ellenbrook Secondary College in lockdown after student stabbed in knife attack

An shot of Ellenbrook Secondary College administrative building

Police patrol the school on Monday afternoon. (ABC News)

In short:

A teenage boy has been stabbed in the arm in a "targeted" knife attack at a Perth school, which sent it into lockdown.

Authorities were called to Ellenbrook Secondary College in Perth's north-east about 3pm on Monday, following reports of "an altercation between a group of youths".

Police say six juvenile males are assisting them with enquiries, and they are looking for one more who is believed to have been involved in the altercation.