Lawless Libya has become a magnet for radical militants who receive weapons training in camps before launching deadly attacks in other countries, like last week's beach massacre in Tunisia.

Tunis says 3,000 of its citizens are fighting alongside extremist groups in Syria, Iraq and Libya, and that 500 battle-hardened veterans have returned home where they pose a security threat.

Authorities identified the gunman as 23-year-old Tunisian student Seifeddine Rezgui and said he had received weapons training from jihadis in Libya.

He was said to have been in Libya at the same time as the two gunmen who in March attacked the National Bardo Museum in Tunis, killing 21 tourists and a policeman.

The coastal town is also only 100 kilometers from Ras Jdir, the main border crossing between Libya and Tunisia.

Tunisian analyst Slaheddin Jourchi said the chaos in Libya posed a "real danger" for his country's "strategic security".

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