India, Feb. 21 -- After opening slightly up, the Canadian market tumbled into negative territory Friday morning as tariff threats and weak commodity prices, as well a few disappointing earnings updates prompted investors to press sales at several counters. Preliminary data showing a likely drop in retail sales in January is weighing as well.

Materials, energy, healthcare and technology stocks are among the notable losers. Several stocks from consumer discretionary sector are also weak. A few stocks from utilities and communications sectors are finding good support.

The benchmark S&P/TSX Composite Index is down 181.82 points or 0.71% at 25,332.26 about half an hour past noon.

The Materials Capped Index is down 1.88%. Iamgold Corp is down ...