<div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>A mystery </span><a href="http://9news.com.au/explosions" rel="" target="" title="blast"><span>blast</span></a><span> has rocked a </span><a href="http://9news.com.au/perth" rel="" target="" title="Perth"><span>Perth</span></a><span> harbour, destroying boats and forcing a popular restaurant to be evacuated. </span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><a href="http://9news.com.au/fire" rel="" target="" title="Firefighters"><span>Firefighters</span></a><span> spent hours battling the blaze overnight at Hillarys Boat Harbour but four vessels were destroyed.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Toxic smoke billowed over the harbour, in the city's north-east, about 10.30pm.</span></div></div><div><div id="adspot-mobile-medium"></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>READ MORE: </span></strong><a href="https://www.9news.com.au/national/camden-car-crash-sydney-maureen-crosland/a5cf40ba-9012-4486-93ac-1a95836c28ed"><strong><span>Church brought to tears by car crash death</span></strong></a></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Skippers stopped in their tracks desperately trying to help. </span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Andrew Beale was among many who called Triple Zero.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"It was amazing how quick it happened, that was the scariest factor," he said.</span></div></div><div><div class="OUTBRAIN" data-reactroot="" data-src="//www.9news.com.au/national/hillarys-boat-harbour-fire-mystery-blast-burns-boats-and-forces-the-breakwater-restaurant-to-evacuate/f1b860dc-3d41-4948-b81b-b035fb997ec3" data-widget-id="AR_5"></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"But fortunately for everyone there was no one on board, everyone was safe."</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Flames were spotted from streets away as The Breakwater was evacuated and a HAZMAT alert issued.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"Unfortunately for us the cause is undetermined due to the fact that by the time fire investigation arrived, all four boats were underwater," Department of Fire and Emergency Services district officer Scott Bulloch said.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Piers melted and the berths were left empty.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>READ MORE: </span></strong><a href="https://www.9news.com.au/national/north-ryde-kidnapping-sydney-chris-baghsarian-police/3cb2fb83-2b2b-4eda-b451-4bcb90ef4480"><strong><span>High-vis man seen before widower abducted</span></strong></a></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>READ MORE: </span></strong><a href="https://www.9news.com.au/national/melbourne-undercover-police-car-ramming/c9376ea5-054f-4d1f-bb89-235a6d4b0629" rel="" target="" title=""><strong><span>Undercover police car rams erratic driver in middle of city</span></strong></a></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>It's the second boat fire at Hillarys in five months.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"Smoke damage – nothing is melted, which is good but we dodged a bullet, that's for sure," boat owner Wayne Adams said.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>It's understood one of the owners sold his boat after 14 years just days earlier.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>They were forced to break the news to the new owner when they came to complete the handover this morning.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Now there's a major recovery mission to resurface the vessels.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><em><strong><span>NEVER MISS A STORY: </span></strong></em><em><span>Get your breaking news and exclusive stories first by following us across all 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