The bomb attacks in Solun were conducted in April 1903 by the Gemidzhii Circle in an attempt to force the European countries to interfere for the improvement of the situation in Aegean Macedonia

 On April 15, 1903, a member of the group, Pavel Shatev, uses dynamite to blow up the French ship “Guadalquivir” which was leaving the Solun harbour. The bomber leaves the ship together with the other passengers; he is later caught by the Turkish police at the Skopie train station. The same night, other group members, Dimitar Mechev, Iliya Trachkov, and Milan Arsov, strike the railway between Thessaloniki and Istanbul, causing damage to the locomotive and some of the cars of a passing train, without wounding passengers.

The commencing signal for the large raid in Solun is given by Kostadin Kirkov who uses explosives to shut off the electricity and water-supplying systems of the city. Jordan Popjordanov (Ortse) blows up the building of an Ottoman Bank office, under which the gemidzhii had previously dug up a tunnel. Milan Arsov throws bombs in the Alhabra Café. The same night Kostadin Kirkov, Il. Bogdanov, and Vladimir Pingov detonate bombs in different parts of the city. Dimitar Mechev and Ilija Truchkov fail to blast the reservoir of a gas-producing plant; they are later on killed in their quarters during a shoot-out with army and gendarmerie forces, against which Mechev and Trachkov use more than 60 bombs. Jordan Popjordanov is killed too on April 17. On April 18, Kostadin Kirkov is also killed, while trying to blow up a postal office. Right before being caught, Cvetko Traikov, whose mission is to kill the local governor, kills himself by setting off a bomb and then sitting on it.

As a response to the attacks, the Turkish Army and bashibozouks (irregulars) massacre many innocent Macedonians in Solun, and later on in Bitola. Pavel Shatev, Marko Boshniakov, Georgi Bogdanov and Milan Arsov are arrested and sentenced by a court martial to a penal colony in Murzuk, in the Fezan District (today’s Libya). Members of the Central Committee of IMORO, including Ivan Garvanov, D. Mirchev, and J. Kondov, along with many other Macedonians from Solun and other cities are incarcerated.