BUZZ-Banks extend gains as ECB considers corporate bond buys
** European banks move higher as Reuters reports ECB looking at purchasing corporate bonds on secondary market.
** Piraeus Bank up 7 pct, Bankinter up 4.7 pct, Commerzbank up 4.6 pct, Natixis up 4.5 pct, Banco Popolare, BP Milano and BP Emilia all up 4 pct or more.
** Action would widen the private-sector asset-buying programme began on Monday.
** Decision could be taken as soon as December with a view to beginning early next year.
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