No visitors were allowed at Gateway of India in Mumbai after city police received threat messages warning '26/11-like' attack. Pic/Atul Kamble

Mumbai Police Commissioner Vivek Phansalkar said that the text messages received by the Mumbai police threatening a "26/11-like" attack in Mumbai came from a phone number that carried the country code of Pakistan. Pic/Atul Kamble

Phansalkar said that after receiving the messages, the state Anti-Terrorism Squad (ATS) and the city police personnel have been put on alert. Pic/Atul Kamble

"Police received messages around 11.30 pm on Friday, which threatened that a 26/11-like attack would be carried out in Mumbai and the city would be blown up. There was a mention of 26/11 attacks terrorist Ajmal Kasab and (deceased) Al Qaeda leader Ayman al-Zawahiri in the messages," Mumbai Police Commissioner said. Pic/Atul Kamble

"It was also mentioned that some of their aides are working in India. Prima facie, the threat messages came from a number that has the country code of Pakistan," Phansalkar said. Pic/Atul Kamble

Police have taken the messages seriously, Phansalkar said while assuring that citizens' safety and security was their responsibility. 'Sagar Kavach' operation has been launched and coastal security been beefed up, the police commissioner said. Pic/Atul Kamble