Boston tunnel fall crushes woman

Milena Delvalle died when concrete ceiling panels fell on her car

A woman was crushed to death in Boston when a multi-ton chunk of concrete fell from a ceiling in part of the city's massive network of underground roads.

Milena Delvalle, 38, died. Her husband Angel Delvalle was slightly injured.

Some of the tunnels are now closed. The accident has raised fresh doubts about the city's $14bn "Big Dig", the largest public works project in US history.

Governor Mitt Romney announced he was taking steps to remove the head of the Massachusetts Turnpike Authority.

Following Monday night's accident, MTA chairman Matthew Amorello said inspectors were examining 17 other sites in the road network where construction was similar to the section that failed.

MTA head Matthew Amorello looks likely to lose his job

"What happened last night was unacceptable," Mr Amorello told reporters.

"I don't think anyone can feel the tunnels are safe, given what happened this morning," Gov Romney said, before saying he would seek to have Mr Amorello removed.

"People should not have to drive through the turnpike tunnels with their fingers crossed."

The New England city's road network is not expected to be fully open again before Wednesday.

The Big Dig dates from the late 1980s, when design plans were drawn up and construction began in 1991. It has been plagued by problems including flooding in 2004.