By Bloomberg News (Bloomberg) — One of the world’s busiest ports could see shipments delayed as a Covid-19 outbreak that earlier closed part of the facility spurs stricter virus-control measures. All cargoes leaving Yantian Port in China will require reservations, according to a port employee, who declined to be identified as they’re not authorized to speak to the media. The port has strengthened its Covid-19 testing program for imports and cargoes into China could also be delayed, the employee said when asked whether vessels arriving at the port could be interrupted. Yantian Port in the export and industrial hub of Shenzhen in southern China had temporarily stopped accepting containers for export until Sunday May 30, according to a notice posted Friday on Wechat. The container yard of the port has been partly shut since last week after an outbreak of Covid-19 among port staff and in the broader community, state media reported.