Police and ambulances are attending the scene of a large blast in Mexico City, where several people are reported to have been injured.

The blast occurred at about 1430 (2030 GMT) near the tourist area known as the Zona Rosa (Pink Zone).

The cause of the explosion was unclear, though a senior police officer said it may have been an explosive device.

[...] The blast occurred near the intersections of Florencia and Chapultepec streets in the city's Zona Rosa neighborhood, a district popular with tourists south of the main business area.

There were no immediate claims of responsibility. More than 2,000 people were killed last year in violence related to drug trafficking, and there have recently been high profile arrests in the capital. Mexico also is home to a rebel group known as the EPR that bombed oil pipelines last year. [...]

[...] City and federal officials say the homemade bomb, which exploded two blocks from a Mexico City police compound Friday afternoon, was likely the work of organized crime rather than leftist rebels. [...]