A toppled cement truck apparently ruptured a gas line on Coburn Street at about 11 a.m. yesterday, resulting in the closure of Dillingham Boulevard in both directions for much of the day.

The truck fell on its side and onto a metal plate, which collapsed under the truck’s weight, according to city spokes­woman Louise Kim McCoy. That apparently caused the gas line below to rupture.

It has not yet been determined what caused the truck to topple.

The Gas Co. shut off gas to three businesses, including Chuck E. Cheese at City Square, while the truck was removed from the hole and the 1-inch gas line repaired, said Steph­a­nie Ackerman, Gas Co. spokes­woman.

The nearby satellite city hall and motor vehicle licensing office were not affected, city officials said.

The road closure affected the stretch of Dillingham between Wai­aka­milo Road and Kohou Street.

The metal plate that the truck fell through was placed on the road by a private contractor working on a private construction project, McCoy said.

All but one eastbound lane of Dillingham Boulevard was reopened by 5 p.m.

Repairs to the gas line were completed at about 7 p.m., and the final closed lane was reopened 45 minutes later.