Eleven people were arrested in the latest dragnet by Quebec's anti-corruption squad, as police announced Thursday that criminal charges will be laid against small-town municipal officials and construction industry players.

Those arrested are accused of participating in fraud schemes of at least $1 million on public-works projects worth $20 million overall.

The arrests are being tied to construction projects south of Montreal, in several municipalities near the U.S. border including St-Jean-sur-Richelieu. About 77 charges have been laid against those 11, and nine companies, for suspected crimes as well as violations of federal competition laws.

The charges include breach of trust, influencing a public official, defrauding the government, producing and using counterfeit documents, accepting a bribe, extortion and conspiracy.

Those arrested Thursday were being questioned and released. They must appear in court on Sept. 7.

The arrests stem from a two-year investigation and are only the latest in a series conducted by the provincial anti-corruption squad. A public inquiry is also underway.

Around 30 people have been arrested in three major raids by the anti-corruption squad since last year, along with other isolated arrests. Eleven companies, including the nine Thursday, are also implicated.

The corruption issue is expected to loom large, along with the student-related unrest, in a provincial election expected as early as September.