Police are baffled by the sudden appearance of a portable lavatory in the middle of a busy street.

Café Cana was a small diner on Avenida Presidente Vargas, the busiest street in the city.

Armed police line both sides of the busy street that leads to the Interlagos track - but teams are taking no chances.

In March 1995 three American consulate officials were ambushed and their van sprayed with gunfire on a busy street in Karachi.

But those more comfortable with their feet on the ground can grab a beer and enjoy dazzling nightly light shows on what is Downtown's busiest street.