Google and Bing gained ground in the U.S. Internet search market in March, while Yahoo saw its shares fall, according to figures released Wednesday by industry tracker comScore.

Monthly figures from the industry researcher show that Google's search market share was 65.7 percent, up from 65.4 percent. Microsoft's sites, including its Bing search engine, came in at 13.9 percent, or up 0.3 percentage point from February's level.

Yahoo! websites remained the second most popular place for Internet searches, but its portion of queries slid 0.4 percent in the month to 15.7 percent, according to comScore.

Ask and AOL saw their search shares drop a tenth of a percentage point each to 3.1 and 1.6 percent respectively, comScore reported.

More than 16.9 billion "explicit core searches" were conducted in March, with Google tending to 11.1 of them, according to comScore.

Explicit searches were described as people seeking online information they clearly intended to interact with.