Authorities in India's Uttar Pradesh state have ordered an investigation into the killing of 31 blackbucks by stray dogs at a zoological park in the city of Kanpur.

BBC: India: Probe into blackbuck killings at Kanpur zoo

Hundreds of rescuers helped by dogs worked overnight and during most of the Friday searching the building in Mexico City for people believed missing after the explosion.

BBC: Mexico blast hunt for survivors at 'dangerous' phase

The large population of stray dogs has long been a problem in Mexico City, correspondents say.

BBC: Mexican pack of stray dogs 'kills four' in park

And 300 dogs will sniff every train car before it starts its trip and again before it enters the city in a hunt for hidden explosives.

CNN: Wary New York stands guard

"They just say that it might snow and the whole city shuts down, " said Sheri Sable, who was out walking her two dogs in light rain and marveled at how even the dog park she frequents failed to open at 7 a.m.

WSJ: Snowstorm spares DC, heads toward New England