A gas leak has blocked off Power Street in Hawthorn, with VicRoads warning of delays for drivers.

Residents were evacuated and the road was closed to traffic in both directions between Riversdale Road and Burwood Road.

Route 75 trams are being diverted via Swan Street between stop 6 Russell Street and stop 29 Riversdale Junction.

The diversion is following Route 70 lines.

Replacement buses are on the way.

Passengers are advised to consider Bus 246 on Punt Road and Route 78 trams on Church Street to connect with diverting services.

A Metropolitan Fire Brigade spokeswoman said they were called to reports of gas leaking from a ruptured pipe at 12.30pm.

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She said two apartment blocks were forced to evacuate while firefighters assessed the area.

Emergency crews were expected at the scene for several hours to ensure it was safe.

There were no reported injuries.

Motorists were advised to use Glenferrie Road or Burnley Street to avoid the closure.

VicRoads said in a statement “delays are likely, so plan ahead and allow extra time”.

josh.fagan@news.com.au