Police in Zimbabwe have arrested at least four members of the main opposition party in connection with a weapons cache found last week.

State media said Thursday that parliament member Giles Mutsekwa and former parliament member Roy Bennett are among those in police custody.

Police say the suspects are linked to an anti-government militia group that they say is allied with the opposition Movement for Democratic Change (MDC).

A spokesman for the opposition party denies that claim, and says the party is not involved in any military plot against the government.

The arrests followed the discovery of a weapons cache including rifles, shotguns, and ammunition in the eastern city of Mutare last Thursday.  The weapons were found at the home of Peter Hinschmann, who was a member of the colonial-era Rhodesian army.

The MDC spokesman says the arrests are a ploy to disrupt an opposition convention scheduled for next week.

The MDC has been weakened by internal disputes that led to a split last month.  Most of the opposition members arrested are reportedly part of the faction led by the party's formal leader, Morgan Tsvangirai.

Some information for this report was provided by AFP, AP and Reuters.