Two large earthquakes have struck western Mexico, shaking buildings as far away as the capital and sending people rushing out of offices on to the streets.
There were no reports of major damage after the first of the two tremors.
The the US Geological Survey said the first quake, on Wednesday evening in the western state of Michoacan, had a magnitude of 6.5 and was recorded at a depth of 12.4 miles.
The second, in the early hours of Thursday off Baja California, was stronger and shallower. It had a magnitude of 6.9 and a depth of 6.2 miles.
Mexico City mayor Marcelo Ebrard, writing on his Twitter account after the first quake, said there were no initial signs of serious damage. Key services in the capital, including its underground system and the international airport, were operating normally.
"There was a nasty crunching sound in my bathroom and everything moved," said Adela Arceo, who was looking after two young children in the central Roma neighbourhood of Mexico City.
There were no initial reports of casualties. Emergency services in Michoacan and in the neighbouring state of Guerrero, which has been hit by a series of recent quakes, reported no significant problems.
"You could feel it, but there's no major damage. There are no reports, no emergency calls," said Agustin Lule, a spokesman for the fire services in Uruapan, a town in Michoacan near the epicentre.
Reuters reporters in coastal areas of Guerrero and neighboring Oaxaca state said there was no damage.
The Honolulu-based Pacific tsunami warning centre said it had issued no warning, but oceanographer David Walsh noted the quake was close to water, big enough and potentially deep enough to cause one.
The quakes followed two others in Mexico within the past month. A 7.4-magnitude shock struck on 20 March, damaging hundreds of buildings in the south-west. It was followed by dozens of aftershocks.
An 8.6-magnitude earthquake also struck off Indonesia on Wednesday, raising fears of a tsunami similar to the one that devastated the Indian Ocean rim in 2004. Authorities, however, said there were no reports suggesting a major threat.
- guardian.co.uk
