British supermarket Morrisons has launched a new service offering Amazon customers same-day deliveries of goods from its stores, deepening the relationship between the two firms but hitting shares in online grocer Ocado.

Ocado has its own distribution agreement with Morrisons and its shares fell 5 percent on concerns the extension of the Amazon partnership will mean it faces more competition.

The new "Morrisons at Amazon" service, launched on Wednesday, will allow Amazon Prime customers in and around London to order the full range of Morrisons' products online via the Prime Now app.

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