Makeshift bombs placed at Greek ministers' offices-police

ATHENS, Oct 23 (Reuters) - Makeshift bombs were placed outside the party offices of a new Greek Socialist minister and a deputy minister in the northern city of Thessaloniki on Friday, police said.

One device, made up of three gas canisters, exploded outside the party office of Greece's Deputy Civil Protection Minister Spyros Vougias, a police spokesman said. There were no injuries.

Another two home-made explosive devices were placed outside the party offices of Justice Minister Harris Kastanidis and a socialist party deputy in the city but did not go off, the spokesman added.

The incidents are the latest in a series of gas canister and bomb attacks by leftist and anarchist groups that have rocked Greece since the police shooting of a teenager sparked the country's worst riots in decades in December.

A new Socialist government swept to power after an Oct. 4 snap election, replacing the conservatives who had ruled the country since 2004. (Reporting by Angeliki Koutantou; editing by Philippa Fletcher)