Amazon.com Inc plans to open new grocery stores across the United States as it looks to expand in the food business, the Wall Street Journal reported on Friday.

Amazon is also exploring a strategy of strengthening its new supermarket brand by purchasing regional grocery chains that operate at least a dozen stores, according to the report.

Amazon, which bought the upscale Whole Foods chain for $13.7 billion in 2017, is now in talks to open grocery stores in shopping centers in San Francisco, Seattle, Chicago, Washington, D.C., and Philadelphia, the WSJ report said.