WASHINGTON (Reuters) - A high-tech "virtual fence" on part of the U.S. border with Mexico is finally ready for service and the technology can fight illegal crossings all along the frontier, the Homeland Security chief said on Friday.

Homeland Security Secretary Michael Chertoff made the announcement during a review of border-control efforts, at which officials also unveiled higher fines for employers who hire illegal immigrants.

TOKYO (Reuters) - Japan launched an experimental communications satellite on Saturday as part of an ambitious space program that could help ensure super high-speed Internet access in remote parts of Japan and elsewhere in Asia.

The H-2A rocket carrying the 2.7 tonne "KIZUNA" (WINDS) communications satellite took off into over the tiny island of Tanegashima, about 1,000 km (620 miles) south of Tokyo, at 5.55 p.m. (0855 GMT).

DETROIT (Reuters) - General Motors Corp Vice Chairman Bob Lutz has defended remarks he made dismissing global warming as a "total crock of s---," saying his views had no bearing on GM's commitment to build environmentally friendly vehicles.

Lutz, GM's outspoken product development chief, has been under fire from Internet bloggers since last month when he was quoted as making the remark to reporters in Texas.