(Reuters) - U.S. stock index futures extended gains after a stronger-than-expected jobs report calmed worries over the health of the labor market amid tensions of a global trade war.

A Labor Department report showed nonfarm payrolls increased 177,000 in April, compared with estimates for a rise of 130,000, according to economists polled by Reuters.

The unemployment rate stood at 4.2%, in line with a forecast of 4.2%.

At 08:30 a.m. ET, Dow E-minis were up 299 points, or 0.73%, S&P 500 E-minis were up 42.25 points, or 0.75%, and Nasdaq 100 E-minis were up 139.5 points, or 0.70%.

(Reporting by Purvi Agarwal in Bengaluru; Editing by Devika Syamnath)