LAC-MEGANTIC, Quebec — Church bells tolled 50 times here yesterday in memory of the 50 people believed to have died in last week’s train derailment.

A minute of silence followed Ste.-Agnes Church’s chimes in this picturesque lakeside town devastated by the runaway train.

Besides the 28 confirmed dead, 22 others are presumed dead.

When the clock struck 1:14 a.m. yesterday, it marked one week to the minute that a locomotive and 72 tankers carrying shale oil slammed into downtown Lac-Megantic after rolling down a slope and gathering speed.

The crash and ensuing explosions destroyed homes, businesses and the Musi-Cafe bar, which was filled with people.

The Montreal, Maine and Atlantic train had been left parked overnight a few miles away.