The number of fatal injuries in America's workplaces fell 7% last year from 2011, but upticks in the construction and oil and gas industries prompted Labor Secretary Tom Perez to call for more diligence. Fatal injuries in private-sector construction rose 5% to 775 in 2012 from 738 in 2011, even though the total hours worked in the industry rose just 1%...In 2012, fatal injuries in the oil and gas extraction industries rose 23% to a record 138. The increases occurred against a more-encouraging backdrop...Mr. Perez...credited "the hard work" of employers, unions, health and safety professionals, and regulators...Mr. Perez also signaled tough enforcement ahead. He said the agency is committed to preventing "these needless deaths"...OSHA is investigating a new spate of deaths in the wireless industry. At least 10 workers died in falls from communications towers this year...The transportation industry also continues to be particularly risky...