Islamabad: Pakistan on October 4 successfully test fired a medium-range nuclear-capable missile, which can penetrate deep into Indian territory, its fourth test since May when it was on the brink of war with India.

Here is a chronology of a missile race carried out against a background of tensions over the disputed Himalayan state of Kashmir and memories of three wars in 1947, 1965 and 1971.

1983: India begins missile development programme, one-upping Pakistan.

1998, April: Pakistan launches the first version of a surface-to-surface Ghauri missile with a range of around 1,500 kilometres (940 miles).

1998, May: India and Pakistan shock the world with a series of tit-for-tat underground nuclear detonations, confirming their long-suspected entry into the exclusive nuclear club.

1999, February 20 and 21: Prime Minister Atal Behari Vajpayee makes the first visit by an Indian head of government to Pakistan in a decade, meeting then Pakistani leader Nawaz Sharif in Lahore. Both men vow to reduce nuclear tensions.

April: India tests the nuclear-capable Agni II, which with a range of around 2,500 kilometres (1,560 miles) could hit anywhere in Pakistan and deep into China. Pakistan retaliates with a test of its Ghauri II missile, with a range of 1,500 kilometres, and its Shaheen missile (800 kilometres or 500 miles).

May 9 to July 12: Indian troops launch a massive offensive against Kashmiri militants who had infiltrated the Kargil region of Kashmir from Pakistani territory. 1,000 people die in the fighting.

October 12: A military coup in Pakistan ousts Prime Minister Nawaz Sharif and brings General Pervez Musharraf to power.

2000, February 7: Pakistan test-fires a short-range Hatf I surface-to-surface ballistic missile reportedly able to reach targets up to 100 (kilometres) away.

November 19: India suspends military operations in Kashmir.

2001, July 15 and 16: Talks at Agra summit between Vajpayee and Musharraf stumble over the Kashmir issue.

September 11: Twin attacks on New York and Washington lead to Pakistan joining the US-led war on terror in neighbouring Afghanistan and cracking down on Kashmiri separatist groups.

October 1: Suicide attack on Parliament in Srinagar, Indian Kashmir. New Delhi accuses Islamabad of backsliding on anti-terror promises.

December 13: Attack on New Delhi Parliament by suicidal gunmen kills 14. India accuses Pakistani intelligence services of masterminding the violence.

December 27: India imposes sanctions on Islamabad and announces Army deploying within three days to Pakistani border. One million troops are now facing off on the border.

2002, January 12: In a landmark speech, President Musharraf announces a crackdown on extremist organisations in Pakistan and bans five groups, including two blamed by India for the New Delhi Parliament attack.

January 25: India test-fires the intermediate Agni I missile with a range of 700 kilometres (440 miles). Islamabad warns test-firing increases regional instability but promises restraint.

April 28: India tests a supersonic cruise missile, known as Brahmos, jointly developed with Russia. The missile has a range of 300 (miles) and can carry a 200-kilogramme (440-pound) conventional warhead.

(In addition to the Agni (Fire) series, India has already inducted the Prithvi (Earth) missile, a more cumbersome, fixed-silo delivery system with a maximum range of 250 kilometres (150 miles). It has also tested a Trident short-range surface-to-air missile.)

May 14: Militants attack a passenger bus and an Army camp near Jammu, Kashmir's winter capital, leaving 35 people dead and triggering a new crisis in relations between India and Pakistan. May 22: Vajpayee tells front-line troops in Kashmir that the time has come for a "decisive fight" which he pledges "we will win".

May 25-28: Pakistan tests three missiles in quick succession, a short-range Abdali and Ghaznavi missile (with a reach of 110 to 180 miles), and a medium-range Ghauri missile.

September 24: India test fires a 'Trident' or Trishul short-range missile, which can carry nine kilometers (5.5 miles).

October 4: Pakistan for the second time tests its Hatf-IV medium-range Shaheen missile amid renewed tensions over a series of killings by Pakistan-supported militants in the Indian state of Kashmir, which is in the midst of Assembly elections.