Gunmen started shooting as they entered the bar in Toa Baja, near the capital San Juan,

Gunmen started shooting as they entered the bar in Toa Baja, near the capital San Juan, prompting several customers to pull out guns and return fire. Seven people were killed and some 20 injured, including a pregnant woman who lost her eight-month-old unborn child. It is one of the most violent single incidents in Puerto Rico in many years. Three people were found dead inside the nightclub and another three were killed just outside, prosecutor Wanda Vazquez said. The seventh victim died in hospital. Investigators suspect the killing was linked to a turf war between drug gangs. "We can't be certain that this was drug-related, but the way it played out appears that it was," Ms Vazquez said. Puerto Rico is a key shipment point in the Caribbean for illegal drugs being smuggled into the US, because as a US territory it is free from customs checks.