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Two people are in hospital following an explosion in Esquimalt Harbour, home to CFB Esquimalt.

According to the Department of National Defence (DND), “an accident involving an explosives detonator on a civilian vessel working on a construction project” occurred just after 11:45 a.m. Friday.

Two sub-contractors sustained minor injuries and are being treated in hospital, the DND said.

The cause of the incident is under investigation.

The explosion comes just a day after two civilian workers were taken to hospital while working on the HMCS Calgary.

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The DND said Thursday the workers became dizzy after inhaling paint fumes from a nearby project at the base, and were treated by medical staff and released.

Officials confirmed the two incidents are not related.

—With files from Kristen Robinson

WATCH: (Aired May 2, 2017) Justin Trudeau tours CFB Esquimalt

0:46 Justin Trudeau pounds the pavement with CFB Esquimalt soldiers Justin Trudeau pounds the pavement with CFB Esquimalt soldiers