MUMBAI // The families of the the victims laid wreaths at a memorial in south Mumbai yesterday to mark the fourth anniversary of the start of the 2008 attacks on the city.
The ceremonies came less than a week after the only surviving gunman was executed.
The Pakistani national Ajmal Kasab was hanged in an Indian prison last Wednesday for his role in the three-day siege that left 166 people dead and more than 300 injured.
The Pakistani Taliban has vowed reprisals unless his body, which was buried in prison, is returned to Pakistan.
"We have issued instructions to our police force to enhance vigilance, this being a 26/11 anniversary," said Sadanand Date, Mumbai's joint commissioner of police.
"We have beefed up security at hotels, airports and crowded places," he added.
Relatives and government ministers attended a ceremony at a memorial to police officers who died during the attacks.
The targets included luxury hotels, a hospital, a railway station and a Jewish centre, where candles were lit in remembrance yesterday.
A "peace march" was held in the city on Sunday night as a tribute to the victims.
Kasab was one of 10 heavily armed Islamist militants who stormed the city and the only one captured alive.
He was sentenced to death in May 2010 after being found guilty of a string of charges, including waging war against India, murder and terrorist acts.
