Dan Sharpe walked for six weeks from Plymouth to Bude in Cornwall.
Officers say they have a "strong belief" the body of missing Corrie Mckeague will be found.
Police say one man has been left with minor injuries after a small "power network explosion".
The US president's comments over the apparent chemical attack in Syria lead Thursday's front pages.
The defence secretary rejects criticism of the aid effort, saying it is "as good as anybody else's".