The latest film in the Bourne series has topped the US box office after taking $60m on its opening weekend. Jason Bourne, which sees Matt Damon return to the lead role, is the fifth instalment of the franchise. Last week's number one - Star Trek Beyond - dropped a place after taking a further $24m over the weekend. Bad Moms took $23.4m to debut at number three. The Secret Life of Pets dropped to number four with takings of $18.2m. Horror film Lights Out rounded off the top five with $10.8m.