Ontario Provincial Police have made 30 arrests and laid 300 charges in an 18-month operation that targeted drugs and weapons that were being smuggled across the border near Cornwall.

Police laid the charges after officers executed 20 search warrants in Cornwall, Stormont, Dundas, Glengarry, Akwesasne, Ottawa, Gatineau and Montreal on Tuesday and Wednesday.

Officers seized cocaine, marijuana, Oxycodone tablets, contraband cigarettes, firearms, ammunition and other items. The items seized have an estimated street value of $4 million, according to police.

The arrests are the result of Project Cinderford, which was launched in December 2009. The investigation focused on organized crime involved in trafficking, importing and exporting controlled substances, weapons and contraband items in the Cornwall area.

The project was led by OPP in partnership with the RCMP, Cornwall police, Akwesasne Mohawk police and the Canada Border Services Agency.