Google has announced that it will be cutting jobs at DoubleClick, the online advertising company that it recently purchased.

One-in-four of DoubleClick's employees in the US are being axed, as part of the plan to integrate the company into its existing operations.

Google said: "Since our acquisition of DoubleClick closed on March 11, we have been working to match and align DoubleClick employees in the US with our organizational plan for the business."

DoubleClick has offices in the UK, France, Germany, Hong Kong, China, Australia and Singapore, and Google warned that overseas employees could be laid off in the future.

Google only announced the purchase last month. DoubleClick helps companies run targeted online advertising campaigns and secure high search engine rankings.

Recently Google launched a new Ad Manager to help web publishers sell empty advertising space on their websites and monitor the traffic that the ads generate.