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Wall Street opened lower today, joining a global equity slump triggered by mounting concerns over Greece's future in the eurozone.

Leading fund managers are divided over whether investors should participate in equity markets if central banks across Europe provide a further round of stimulus.

European equity markets have extended this week's losses at the open on Friday, after US stocks closed lower overnight, dragged down by the ongoing Greek crisis.

Neptune's Rob Burnett has outlined three potential positives for the eurozone as the region struggles through the latest phase of its debt crisis.

Markets across Europe suffered more losses this afternoon after Greece reportedly confirmed it has failed to form a coalition government.

BlackRock's head of European equities Nigel Bolton has said Greece should never have been granted membership to the eurozone because of its weak economy, and warned it must leave as soon as possible.

(Updated: 9.15) Asian indices fell overnight, mirroring losses in the US and Europe, over fears about the impact a Greek exit from the single currency could have on the rest of the region.

As the eurozone crisis continues to batter markets today, we highlight the five key challenges facing the continent.

GOSLING'S GROUSE

The UK's leading share index has fallen to its lowest level this year, slipping below 5,500, as Greece's continued failure to form a coalition government dampens risk appetite.