Twin blasts ripped through a crowded market in Hyderabad yesterday, leaving 16 dead and 120 injured.
The Ministry had sent specific alert yesterday morning to four cities -- Hyderabad, Bangalore, Coimbatore and Hubli -- warning them of probable attacks by terrorists, they said.
Besides, Maharashtra and Gujarat police forces were also sent the alert, the officials said.
According to Home Ministry officials, the alerts were also sent to all states on February 19 and 20, that Pakistan-based terrorist groups may carry out attacks in a major city to avenge the hanging of 26/11 terrorist Ajmal Kasab and Parliament attack convict Afzal Guru.
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The security agencies sent another advisory on Wednesday saying banned Indian Mujahideen may carry out terror attacks to avenge the hanging of Kasab and Guru.
Home Minister Sushilkumar Shinde had yesterday said all states were alerted about a possible terror strike by militant groups.
However, Andhra Pradesh Chief Minister Kiran Kumar Reddy had said those were general alerts which often keep coming from the Centre.