First of series of implosions fells part of span.
A large section of the Long Island Bridge was demolished Monday as contractors imploded a 750-foot-long piece that connects to the island, officials said.
The Coast Guard had set up a 1,000-yard safety zone between Moon Island and Long Island, and marine units from State, Boston, and Quincy police were on the scene to steer boaters away from the area, officials said.
The demolition targeted three sections of the bridge — sections 12, 13, and 14 — each of them 250 feet long, according to Boston Mayor Martin J. Walsh’s office.
Part of the ailing bridge was already removed in late February.
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