Bond plants a bomb outside Sanchez's window at the Casino de Isthmus, which is in a fictitious Banana Republic eerily similar to Panama. Q picks Bond up outside the Casino in a Rolls-Royce. As they leave, a brown Caprice with a man inside follows them.
This is a short follow. Q drops Bond off a block away at an abandoned building. There, Bond has a clear shot at Sanchez. We later find out that the Caprice was driven by a British agent working in cooperation with narcs from Hong Kong.