As terrorists struck in India yesterday, security was beefed up at major transportation points in New York City on the news that al-Qaida may have discussed a possible terror attack on our transit system.

The warning was contained in a bulletin sent by the FBI and Department of Homeland Security to local and state authorities.

It cited “uncorroborated but plausible information that al-Qaida may have discussed in late September the targeting of transit systems in and around New York City.”

Even though word of the terror alert came on the busiest travel day of the year, reaction among travelers was mixed.

DHS officials say they are not raising the terror alert level.

The Metropolitan Transportation Authority and the NYPD are encouraging New Yorkers to remain alert and tell police or an MTA employee about any suspicious people or packages.