KAJANG, Malaysia, Sept 16 (AFP) - Malaysia's ousted deputy prime minister Anwar Ibrahim joined opposition leader Lim Kit Siang Wednesday in visiting the site of an 18-day hunger strike in protest at the jailing of Lim's son.

Lim Guan Eng, an opposition member of parliament, was recently sentenced to 18 months in prison for publishing false news and sedition, an allegation that has also been levelled against Anwar.

Both father and son belong to the Democratic Action Party (DAP) which is headed by the elder Lim.

The DAP leader has visited Anwar several times since his dismissal and subsequent expulsion from the ruling party earlier this month.

Earlier Wednesday the opposition party said it welcomed a weekend declaration by Anwar, describing it as a ''basis for a national movement for justice, freedom, democracy and good governance.''

Lim has repeatedly denounced the manner in which Prime Minister Mahathir Mohamad summarily dismissed Anwar. He suggested Wednesday that authorities were preparing for mass arrests under the draconian Internal Security Act which provides for indefinite detention without trial.

Apart from sedition, Anwar has been accused of sexual impropriety, bribery, jeopardising national security, interfering with police investigations, tampering with evidence and abuse of power.

Anwar, who has still not been formally charged, denies the accusations and says he is the victim of a high-level conspiracy.