A man has been charged after homemade bomb was found at a train station in Perth’s north on Thursday.

Police allege the 45-year-old left the improvised explosive device at the Currambine station about 4.15pm, before he boarded a train.

A member of the public found it before alerting transit officers, who contacted police.

“The item was identified by police as an improvised explosive device of low sophistication and a with minimal impact area,” a police spokeswoman said.

State Security Investigation Group detectives laid charges over the incident after the man was apprehended in Northbridge yesterday afternoon.

The man, who has no fixed address, was charged with possession of explosives under suspicious circumstances, drug possession, possession of drug paraphernalia and carrying an article with intent to cause fear.

He will appear in Perth Magistrates Court today.