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What happened in Piraeus on the night of 6 April 1941?
Short answer
Luftwaffe Junkers Ju 88 bombers, led by Hans-Joachim "Hajo" Herrmann, attacked the ships in Piraeus on 6 April 1941. At 03:15 the Clan Fraser, still unloading weapons and 200 tons of TNT, blew up. By dawn the port was badly damaged.

The invasion and the attack on the port
On 6 April 1941 German forces invaded Greece, and Luftwaffe Junkers Ju 88 bombers, led by Hans-Joachim "Hajo" Herrmann, attacked ships anchored in Piraeus. The Clan Fraser was in the port, still unloading its cargo of weapons and 200 tons of TNT. At 03:15 it was hit and destroyed when that TNT exploded.
An explosion felt in Athens
The ship sank in the port, killing six and wounding nine. Its captain, J. H. Giles, was among the survivors. The shockwave from the blast was felt 15 miles (24 km) away in Athens, where it blew open doors, and in Psychiko, where it shattered windows.
The port at dawn
The glowing debris thrown out by the explosion detonated the TNT on other nearby ships and set them on fire, along with buildings on shore. By morning the port had suffered serious damage.
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