Amazon.com Inc (AMZN.O) on Wednesday said it will invest a further $2 billion in India just a day after the country’s largest e-tailer Flipkart attracted $1 billion of fresh funds, raising the stakes in a nascent but fast-growing e-commerce sector. Amazon, which opened its Indian website in June last year, has drawn up the battle lines by slashing prices, launching same-day delivery, adding new product categories and embarking on a high-voltage advertisement campaign.