City: Three explosions set for tomorrow afternoon in the Fenway

The mayor's office now says people near Landmark Center can expect to hear three explosions between 1 and 3 p.m. tomorrow as contractors use the sound waves to test pilings and other underground structures near the Muddy River reclamation project.

The sound will last approximately one second each time. Seven police details will be on site during the testing to stop vehicles briefly on nearby roads.