The explosion took place on Habib Bourguiba avenue, central Tunis, near the city's Municipal Theater.
I'm at the scene where a woman blew herself up in central Tunis. Initial reports suggest six police officers were killed. pic.twitter.com/HWxLevXGvtWitness Mohamed Ekbal bin Rajib told Reuters that he was "in front of the theater and heard a huge explosion and saw people fleeing." Ambulances also could be heard rushing to the scene.
- Anelise Borges (@AnneliseBorges) October 29, 2018
Several ambulances and police are already on the scene, as videos uploaded to social media show officials examining the body of the woman and trying control panicked crowds.
Interior Ministry spokesman Sufian al-Zaq has confirmed that eight police and one citizen have been injured in the explosion, Local Arabic newspaper Al Chourouk reports. The bombing took place next to a police van and near a hotel.
Tunisia was shaken in 2015 after a spate of large attacks against tourists. 21 people were killed in a hostage siege in the Bardo National Museum in Tunis, and another rogue gunman murdered 38 on a beach at the Port El Kantaoui resort.
Although there were no attacks of that scale since then, the security situation, dependent on tourism, remains tense, with turmoil in neighbouring Libya, which is overrun by militant groups including Islamic State, being the biggest concern.
The UK Foreign Office has warned that terrorist attacks are still "very likely" in Tunisia, "including against UK and Western interests."
Police are also frequently targeted. The democratic Arab nation has been under a state of emergency since a suicide bomb attack on a police bus in November 2015.
The state of emergency has been extended a number of times, most recently at the start of October.
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