United States has reiterated its help in capacity building of Bangladesh's counter-terrorism unit following the two back-to-back attacks in July's first week.

Visiting US Assistant Secretary of State for South and Central Asian Affairs Nisha Desai Biswal made the offer while meeting Bangladesh's top officials.

"We will continue our assistance in combating the global threat of terrorism that our countries both confront," she said, according to a press release of the US embassy.

Arriving in Dhaka on a two-day visit over security issue, Biswal met Foreign Minister AH Mahmood Ali and Foreign Secretary Shahidul Haque today.

"Our commitment to Bangladesh remains as robust as ever," she told the officials.

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In the meeting, the US side was attended by US envoy to Dhaka Marcia Bernicat and visiting Deputy Assistant Secretary of State for South and Central Asian Affairs Manpreet Anand.

On July 1, alleged Islamic State gunmen killed 20 hostages and two policemen in a nearly 12-hour long siege on a restaurant in Dhaka's diplomatic zone.

Most of the hostages slain were foreign nationals and included a US citizen. Many countries issued travel alerts on Bangladesh after the incident.

The US, which renewed an alert it issued earlier this year, said it believes that a threat of terrorism is very real in Bangladesh and foreign nationals are most likely to be its victims.

Barely six days into the attack, assailants struck on Sholakia Eidgah in Kishoreganj, the site of country's largest Eid congregation on Eid day. Four, including two policemen, were killed.