Groupe Eurotunnel SA said its Channel Tunnel rail link between Britain and France should reopen to vehicle shuttles before midnight after being closed earlier today when smoke from a truck triggered carbon dioxide alarms.

Specialist response teams checked the length of the stricken train and traced the problem to a “smoldering load” on the rear of a lorry, which was doused to eliminate any risk of a blaze, Eurotunnel spokesman John Keefe said by telephone.

Eurotunnel’s Folkestone-Calais shuttle will resume tonight using the southbound tunnel with trains alternating in either direction, Keefe said. The northbound tube where the incident occurred is likely to open tomorrow after it has been cleaned up, though there appears to be “no serious damage,” he said.

Eurostar International Ltd. earlier halted passenger trains linking London with France and Belgium for the day, and Keefe said it’s for the company to decide when to resume operations. The 30-mile tunnel has suffered a number of fire-related shutdowns since it opened in 1994, including a two-hour closure in 2012 and one spanning two days in 2008, when a tube was out of action for five months. The events all involved trucks.

Police in Kent on the U.K. side of the tunnel said earlier that no one had been injured in today’s incident and Keefe said the temperatures involved are understood not to have been as high as in earlier shutdowns, with the affected train due to be removed from the scene shortly.

While Eurostar passengers can rebook their journey any time within the next 60 days for travel in the next six months, according to the company’s website, Keefe said there has been no backlog of cars and trucks at shuttle terminals as vehicles were diverted to MyFerryLink sailings between Dover and Calais.

Eurotunnel said last week it’s seeking a buyer for MyFerryLink after a U.K. court upheld a regulator’s decision blocking it from owning the business on antitrust grounds.